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Date: Tue, 6 Apr 2021 02:47:25 -0400
From: Alex Ghiti <alex@...ti.fr>
To: Vitaly Wool <vitaly.wool@...sulko.com>
Cc: Palmer Dabbelt <palmerdabbelt@...gle.com>,
linux-riscv <linux-riscv@...ts.infradead.org>,
LKML <linux-kernel@...r.kernel.org>,
Bin Meng <bin.meng@...driver.com>,
Anup Patel <anup@...infault.org>,
Alistair Francis <Alistair.Francis@....com>,
Nicolas Pitre <nico@...xnic.net>
Subject: Re: [PATCH v6] RISC-V: enable XIP
Hi Vitaly,
Le 4/5/21 à 4:34 AM, Vitaly Wool a écrit :
> On Sun, Apr 4, 2021 at 10:39 AM Vitaly Wool <vitaly.wool@...sulko.com> wrote:
>>
>> On Sat, Apr 3, 2021 at 12:00 PM Alex Ghiti <alex@...ti.fr> wrote:
>>>
>>> Hi Vitaly,
>>>
>>> Le 4/1/21 à 7:10 AM, Alex Ghiti a écrit :
>>>> Le 4/1/21 à 4:52 AM, Vitaly Wool a écrit :
>>>>> Hi Alex,
>>>>>
>>>>> On Thu, Apr 1, 2021 at 10:11 AM Alex Ghiti <alex@...ti.fr> wrote:
>>>>>>
>>>>>> Hi,
>>>>>>
>>>>>> Le 3/30/21 à 4:04 PM, Alex Ghiti a écrit :
>>>>>>> Le 3/30/21 à 3:33 PM, Palmer Dabbelt a écrit :
>>>>>>>> On Tue, 30 Mar 2021 11:39:10 PDT (-0700), alex@...ti.fr wrote:
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> Le 3/30/21 à 2:26 AM, Vitaly Wool a écrit :
>>>>>>>>>> On Tue, Mar 30, 2021 at 8:23 AM Palmer Dabbelt
>>>>>>>>>> <palmerdabbelt@...gle.com> wrote:
>>>>>>>>>>>
>>>>>>>>>>> On Sun, 21 Mar 2021 17:12:15 PDT (-0700), vitaly.wool@...sulko.com
>>>>>>>>>>> wrote:
>>>>>>>>>>>> Introduce XIP (eXecute In Place) support for RISC-V platforms.
>>>>>>>>>>>> It allows code to be executed directly from non-volatile storage
>>>>>>>>>>>> directly addressable by the CPU, such as QSPI NOR flash which can
>>>>>>>>>>>> be found on many RISC-V platforms. This makes way for significant
>>>>>>>>>>>> optimization of RAM footprint. The XIP kernel is not compressed
>>>>>>>>>>>> since it has to run directly from flash, so it will occupy more
>>>>>>>>>>>> space on the non-volatile storage. The physical flash address used
>>>>>>>>>>>> to link the kernel object files and for storing it has to be known
>>>>>>>>>>>> at compile time and is represented by a Kconfig option.
>>>>>>>>>>>>
>>>>>>>>>>>> XIP on RISC-V will for the time being only work on MMU-enabled
>>>>>>>>>>>> kernels.
>>>>>>>>>>>>
>>>>>>>>>>>> Signed-off-by: Vitaly Wool <vitaly.wool@...sulko.com>
>>>>>>>>>>>>
>>>>>>>>>>>> ---
>>>>>>>>>>>>
>>>>>>>>>>>> Changes in v2:
>>>>>>>>>>>> - dedicated macro for XIP address fixup when MMU is not enabled
>>>>>>>>>>>> yet
>>>>>>>>>>>> o both for 32-bit and 64-bit RISC-V
>>>>>>>>>>>> - SP is explicitly set to a safe place in RAM before
>>>>>>>>>>>> __copy_data call
>>>>>>>>>>>> - removed redundant alignment requirements in vmlinux-xip.lds.S
>>>>>>>>>>>> - changed long -> uintptr_t typecast in __XIP_FIXUP macro.
>>>>>>>>>>>> Changes in v3:
>>>>>>>>>>>> - rebased against latest for-next
>>>>>>>>>>>> - XIP address fixup macro now takes an argument
>>>>>>>>>>>> - SMP related fixes
>>>>>>>>>>>> Changes in v4:
>>>>>>>>>>>> - rebased against the current for-next
>>>>>>>>>>>> - less #ifdef's in C/ASM code
>>>>>>>>>>>> - dedicated XIP_FIXUP_OFFSET assembler macro in head.S
>>>>>>>>>>>> - C-specific definitions moved into #ifndef __ASSEMBLY__
>>>>>>>>>>>> - Fixed multi-core boot
>>>>>>>>>>>> Changes in v5:
>>>>>>>>>>>> - fixed build error for non-XIP kernels
>>>>>>>>>>>> Changes in v6:
>>>>>>>>>>>> - XIP_PHYS_RAM_BASE config option renamed to PHYS_RAM_BASE
>>>>>>>>>>>> - added PHYS_RAM_BASE_FIXED config flag to allow usage of
>>>>>>>>>>>> PHYS_RAM_BASE in non-XIP configurations if needed
>>>>>>>>>>>> - XIP_FIXUP macro rewritten with a tempoarary variable to avoid
>>>>>>>>>>>> side
>>>>>>>>>>>> effects
>>>>>>>>>>>> - fixed crash for non-XIP kernels that don't use built-in DTB
>>>>>>>>>>>
>>>>>>>>>>> So v5 landed on for-next, which generally means it's best to avoid
>>>>>>>>>>> re-spinning the patch and instead send along fixups. That said,
>>>>>>>>>>> the v5
>>>>>>>>>>> is causing some testing failures for me.
>>>>>>>>>>>
>>>>>>>>>>> I'm going to drop the v5 for now as I don't have time to test this
>>>>>>>>>>> tonight. I'll try and take a look soon, as it will conflict with
>>>>>>>>>>> Alex's
>>>>>>>>>>> patches.
>>>>>>>>>>
>>>>>>>>>> I can come up with the incremental patch instead pretty much
>>>>>>>>>> straight
>>>>>>>>>> away if that works better.
>>>>>>>>>>
>>>>>>>>>> ~Vitaly
>>>>>>>>>>
>>>>>>>>>>>> arch/riscv/Kconfig | 49 ++++++++++-
>>>>>>>>>>>> arch/riscv/Makefile | 8 +-
>>>>>>>>>>>> arch/riscv/boot/Makefile | 13 +++
>>>>>>>>>>>> arch/riscv/include/asm/pgtable.h | 65 ++++++++++++--
>>>>>>>>>>>> arch/riscv/kernel/cpu_ops_sbi.c | 11 ++-
>>>>>>>>>>>> arch/riscv/kernel/head.S | 49 ++++++++++-
>>>>>>>>>>>> arch/riscv/kernel/head.h | 3 +
>>>>>>>>>>>> arch/riscv/kernel/setup.c | 8 +-
>>>>>>>>>>>> arch/riscv/kernel/vmlinux-xip.lds.S | 132
>>>>>>>>>>>> ++++++++++++++++++++++++++++
>>>>>>>>>>>> arch/riscv/kernel/vmlinux.lds.S | 6 ++
>>>>>>>>>>>> arch/riscv/mm/init.c | 100 +++++++++++++++++++--
>>>>>>>>>>>> 11 files changed, 426 insertions(+), 18 deletions(-)
>>>>>>>>>>>> create mode 100644 arch/riscv/kernel/vmlinux-xip.lds.S
>>>>>>>>>>>>
>>>>>>>>>>>> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
>>>>>>>>>>>> index 8ea60a0a19ae..bd6f82240c34 100644
>>>>>>>>>>>> --- a/arch/riscv/Kconfig
>>>>>>>>>>>> +++ b/arch/riscv/Kconfig
>>>>>>>>>>>> @@ -441,7 +441,7 @@ config EFI_STUB
>>>>>>>>>>>>
>>>>>>>>>>>> config EFI
>>>>>>>>>>>> bool "UEFI runtime support"
>>>>>>>>>>>> - depends on OF
>>>>>>>>>>>> + depends on OF && !XIP_KERNEL
>>>>>>>>>>>> select LIBFDT
>>>>>>>>>>>> select UCS2_STRING
>>>>>>>>>>>> select EFI_PARAMS_FROM_FDT
>>>>>>>>>>>> @@ -465,11 +465,56 @@ config STACKPROTECTOR_PER_TASK
>>>>>>>>>>>> def_bool y
>>>>>>>>>>>> depends on STACKPROTECTOR && CC_HAVE_STACKPROTECTOR_TLS
>>>>>>>>>>>>
>>>>>>>>>>>> +config PHYS_RAM_BASE_FIXED
>>>>>>>>>>>> + bool "Explicitly specified physical RAM address"
>>>>>>>>>>>> + default n
>>>>>>>>>>>> +
>>>>>>>>>>>> +config PHYS_RAM_BASE
>>>>>>>>>>>> + hex "Platform Physical RAM address"
>>>>>>>>>>>> + depends on PHYS_RAM_BASE_FIXED
>>>>>>>>>>>> + default "0x80000000"
>>>>>>>>>>>> + help
>>>>>>>>>>>> + This is the physical address of RAM in the system. It has
>>>>>>>>>>>> to be
>>>>>>>>>>>> + explicitly specified to run early relocations of
>>>>>>>>>>>> read-write data
>>>>>>>>>>>> + from flash to RAM.
>>>>>>>>>>>> +
>>>>>>>>>>>> +config XIP_KERNEL
>>>>>>>>>>>> + bool "Kernel Execute-In-Place from ROM"
>>>>>>>>>>>> + depends on MMU
>>>>>>>>>>>> + select PHYS_RAM_BASE_FIXED
>>>>>>>>>>>> + help
>>>>>>>>>>>> + Execute-In-Place allows the kernel to run from
>>>>>>>>>>>> non-volatile storage
>>>>>>>>>>>> + directly addressable by the CPU, such as NOR flash. This
>>>>>>>>>>>> saves RAM
>>>>>>>>>>>> + space since the text section of the kernel is not loaded
>>>>>>>>>>>> from flash
>>>>>>>>>>>> + to RAM. Read-write sections, such as the data section and
>>>>>>>>>>>> stack,
>>>>>>>>>>>> + are still copied to RAM. The XIP kernel is not compressed
>>>>>>>>>>>> since
>>>>>>>>>>>> + it has to run directly from flash, so it will take more
>>>>>>>>>>>> space to
>>>>>>>>>>>> + store it. The flash address used to link the kernel
>>>>>>>>>>>> object files,
>>>>>>>>>>>> + and for storing it, is configuration dependent. Therefore,
>>>>>>>>>>>> if you
>>>>>>>>>>>> + say Y here, you must know the proper physical address
>>>>>>>>>>>> where to
>>>>>>>>>>>> + store the kernel image depending on your own flash memory
>>>>>>>>>>>> usage.
>>>>>>>>>>>> +
>>>>>>>>>>>> + Also note that the make target becomes "make xipImage"
>>>>>>>>>>>> rather than
>>>>>>>>>>>> + "make zImage" or "make Image". The final kernel binary to
>>>>>>>>>>>> put in
>>>>>>>>>>>> + ROM memory will be arch/riscv/boot/xipImage.
>>>>>>>>>>>> +
>>>>>>>>>>>> + If unsure, say N.
>>>>>>>>>>>> +
>>>>>>>>>>>> +config XIP_PHYS_ADDR
>>>>>>>>>>>> + hex "XIP Kernel Physical Location"
>>>>>>>>>>>> + depends on XIP_KERNEL
>>>>>>>>>>>> + default "0x21000000"
>>>>>>>>>>>> + help
>>>>>>>>>>>> + This is the physical address in your flash memory the
>>>>>>>>>>>> kernel will
>>>>>>>>>>>> + be linked for and stored to. This address is dependent on
>>>>>>>>>>>> your
>>>>>>>>>>>> + own flash usage.
>>>>>>>>>>>> +
>>>>>>>>>>>> endmenu
>>>>>>>>>>>>
>>>>>>>>>>>> config BUILTIN_DTB
>>>>>>>>>>>> - def_bool n
>>>>>>>>>>>> + bool
>>>>>>>>>>>> depends on OF
>>>>>>>>>>>> + default y if XIP_KERNEL
>>>>>>>>>>>>
>>>>>>>>>>>> menu "Power management options"
>>>>>>>>>>>>
>>>>>>>>>>>> diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
>>>>>>>>>>>> index 1368d943f1f3..8fcbec03974d 100644
>>>>>>>>>>>> --- a/arch/riscv/Makefile
>>>>>>>>>>>> +++ b/arch/riscv/Makefile
>>>>>>>>>>>> @@ -82,7 +82,11 @@ CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)
>>>>>>>>>>>>
>>>>>>>>>>>> # Default target when executing plain make
>>>>>>>>>>>> boot := arch/riscv/boot
>>>>>>>>>>>> +ifeq ($(CONFIG_XIP_KERNEL),y)
>>>>>>>>>>>> +KBUILD_IMAGE := $(boot)/xipImage
>>>>>>>>>>>> +else
>>>>>>>>>>>> KBUILD_IMAGE := $(boot)/Image.gz
>>>>>>>>>>>> +endif
>>>>>>>>>>>>
>>>>>>>>>>>> head-y := arch/riscv/kernel/head.o
>>>>>>>>>>>>
>>>>>>>>>>>> @@ -95,12 +99,14 @@ PHONY += vdso_install
>>>>>>>>>>>> vdso_install:
>>>>>>>>>>>> $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@
>>>>>>>>>>>>
>>>>>>>>>>>> +ifneq ($(CONFIG_XIP_KERNEL),y)
>>>>>>>>>>>> ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_SOC_CANAAN),yy)
>>>>>>>>>>>> KBUILD_IMAGE := $(boot)/loader.bin
>>>>>>>>>>>> else
>>>>>>>>>>>> KBUILD_IMAGE := $(boot)/Image.gz
>>>>>>>>>>>> endif
>>>>>>>>>>>> -BOOT_TARGETS := Image Image.gz loader loader.bin
>>>>>>>>>>>> +endif
>>>>>>>>>>>> +BOOT_TARGETS := Image Image.gz loader loader.bin xipImage
>>>>>>>>>>>>
>>>>>>>>>>>> all: $(notdir $(KBUILD_IMAGE))
>>>>>>>>>>>>
>>>>>>>>>>>> diff --git a/arch/riscv/boot/Makefile b/arch/riscv/boot/Makefile
>>>>>>>>>>>> index 03404c84f971..6bf299f70c27 100644
>>>>>>>>>>>> --- a/arch/riscv/boot/Makefile
>>>>>>>>>>>> +++ b/arch/riscv/boot/Makefile
>>>>>>>>>>>> @@ -17,8 +17,21 @@
>>>>>>>>>>>> KCOV_INSTRUMENT := n
>>>>>>>>>>>>
>>>>>>>>>>>> OBJCOPYFLAGS_Image :=-O binary -R .note -R
>>>>>>>>>>>> .note.gnu.build-id -R
>>>>>>>>>>>> .comment -S
>>>>>>>>>>>> +OBJCOPYFLAGS_xipImage :=-O binary -R .note -R .note.gnu.build-id
>>>>>>>>>>>> -R .comment -S
>>>>>>>>>>>>
>>>>>>>>>>>> targets := Image Image.* loader loader.o loader.lds loader.bin
>>>>>>>>>>>> +targets := Image Image.* loader loader.o loader.lds loader.bin
>>>>>>>>>>>> xipImage
>>>>>>>>>>>> +
>>>>>>>>>>>> +ifeq ($(CONFIG_XIP_KERNEL),y)
>>>>>>>>>>>> +
>>>>>>>>>>>> +quiet_cmd_mkxip = $(quiet_cmd_objcopy)
>>>>>>>>>>>> +cmd_mkxip = $(cmd_objcopy)
>>>>>>>>>>>> +
>>>>>>>>>>>> +$(obj)/xipImage: vmlinux FORCE
>>>>>>>>>>>> + $(call if_changed,mkxip)
>>>>>>>>>>>> + @$(kecho) ' Physical Address of xipImage:
>>>>>>>>>>>> $(CONFIG_XIP_PHYS_ADDR)'
>>>>>>>>>>>> +
>>>>>>>>>>>> +endif
>>>>>>>>>>>>
>>>>>>>>>>>> $(obj)/Image: vmlinux FORCE
>>>>>>>>>>>> $(call if_changed,objcopy)
>>>>>>>>>>>> diff --git a/arch/riscv/include/asm/pgtable.h
>>>>>>>>>>>> b/arch/riscv/include/asm/pgtable.h
>>>>>>>>>>>> index ebf817c1bdf4..21a9b2f8d1c7 100644
>>>>>>>>>>>> --- a/arch/riscv/include/asm/pgtable.h
>>>>>>>>>>>> +++ b/arch/riscv/include/asm/pgtable.h
>>>>>>>>>>>> @@ -11,6 +11,33 @@
>>>>>>>>>>>>
>>>>>>>>>>>> #include <asm/pgtable-bits.h>
>>>>>>>>>>>>
>>>>>>>>>>>> +#ifdef CONFIG_MMU
>>>>>>>>>>>> +
>>>>>>>>>>>> +#define VMALLOC_START (PAGE_OFFSET - VMALLOC_SIZE)
>>>>>>>>>>>> +
>>>>>>>>>>>> +#ifdef CONFIG_XIP_KERNEL
>>>>>>>>>>>> +#define VMALLOC_SIZE ((KERN_VIRT_SIZE >> 1) - SZ_16M)
>>>>>>>>>>>> +#define VMALLOC_END (PAGE_OFFSET - SZ_16M - 1)
>>>>>>>>>>>> +
>>>>>>>>>>>> +#define XIP_OFFSET SZ_8M
>>>>>>>>>>>> +#define XIP_MASK (SZ_8M - 1)
>>>>>>>>>>>> +#define XIP_VIRT_ADDR(physaddr) \
>>>>>>>>>>>> + (PAGE_OFFSET - XIP_OFFSET + ((physaddr) & XIP_MASK))
>>>>>>>>>>>> +
>>>>>>>>>>>> +#else
>>>>>>>>>>>> +
>>>>>>>>>>>> +#define VMALLOC_SIZE (KERN_VIRT_SIZE >> 1)
>>>>>>>>>>>> +#define VMALLOC_END (PAGE_OFFSET - 1)
>>>>>>>>>>>> +
>>>>>>>>>>>> +#endif /* CONFIG_XIP_KERNEL */
>>>>>>>>>>>> +
>>>>>>>>>>>> +#else
>>>>>>>>>>>> +
>>>>>>>>>>>> +#ifdef CONFIG_XIP_KERNEL
>>>>>>>>>>>> +#define XIP_VIRT_ADDR(physaddr) (physaddr)
>>>>>>>>>>>> +#endif /* CONFIG_XIP_KERNEL */
>>>>>>>>>>>> +#endif /* CONFIG_MMU */
>>>>>>>>>>>> +
>>>>>>>>>>>> #ifndef __ASSEMBLY__
>>>>>>>>>>>>
>>>>>>>>>>>> /* Page Upper Directory not used in RISC-V */
>>>>>>>>>>>> @@ -21,9 +48,25 @@
>>>>>>>>>>>>
>>>>>>>>>>>> #ifdef CONFIG_MMU
>>>>>>>>>>>>
>>>>>>>>>>>> -#define VMALLOC_SIZE (KERN_VIRT_SIZE >> 1)
>>>>>>>>>>>> -#define VMALLOC_END (PAGE_OFFSET - 1)
>>>>>>>>>>>> -#define VMALLOC_START (PAGE_OFFSET - VMALLOC_SIZE)
>>>>>>>>>>>> +#ifdef CONFIG_XIP_KERNEL
>>>>>>>>>>>> +/*
>>>>>>>>>>>> + * Since we use sections to map it, this macro replaces the
>>>>>>>>>>>> physical address
>>>>>>>>>>>> + * with its virtual address while keeping offset from the base
>>>>>>>>>>>> section.
>>>>>>>>>>>> + */
>>>>>>>>>>>> +#define XIP_PHYS_ADDR(va) \
>>>>>>>>>>>> + ((uintptr_t)(va) - PAGE_OFFSET + XIP_OFFSET +
>>>>>>>>>>>> CONFIG_XIP_PHYS_ADDR)
>>>>>>>>>>>> +
>>>>>>>>>>>> +#define XIP_VIRT_ADDR_START XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR)
>>>>>>>>>>>> +
>>>>>>>>>>>> +#define XIP_FIXUP(addr) ({ \
>>>>>>>>>>>> + uintptr_t __a = (uintptr_t)(addr); \
>>>>>>>>>>>> + (__a >= CONFIG_XIP_PHYS_ADDR && \
>>>>>>>>>>>> + __a < CONFIG_XIP_PHYS_ADDR + SZ_16M) ? \
>>>>>>>>>>>> + __a - CONFIG_XIP_PHYS_ADDR + CONFIG_PHYS_RAM_BASE -
>>>>>>>>>>>> XIP_OFFSET : __a; \
>>>>>>>>>>>> +})
>>>>>>>>>>>> +#else
>>>>>>>>>>>> +#define XIP_FIXUP(addr) (addr)
>>>>>>>>>>>> +#endif /* CONFIG_XIP_KERNEL */
>>>>>>>>>>>>
>>>>>>>>>>>> #define BPF_JIT_REGION_SIZE (SZ_128M)
>>>>>>>>>>>> #define BPF_JIT_REGION_START (PAGE_OFFSET -
>>>>>>>>>>>> BPF_JIT_REGION_SIZE)
>>>>>>>>>>>> @@ -484,8 +527,20 @@ static inline int
>>>>>>>>>>>> ptep_clear_flush_young(struct vm_area_struct *vma,
>>>>>>>>>>>>
>>>>>>>>>>>> #define kern_addr_valid(addr) (1) /* FIXME */
>>>>>>>>>>>>
>>>>>>>>>>>> -extern void *dtb_early_va;
>>>>>>>>>>>> -extern uintptr_t dtb_early_pa;
>>>>>>>>>>>> +extern void *_dtb_early_va;
>>>>>>>>>>>> +extern uintptr_t _dtb_early_pa;
>>>>>>>>>>>> +#if defined(CONFIG_XIP_KERNEL) && defined(CONFIG_MMU)
>>>>>>>>>>>> +
>>>>>>>>>>>> +#define dtb_early_va (*(void **)XIP_FIXUP(&_dtb_early_va))
>>>>>>>>>>>> +#define dtb_early_pa (*(uintptr_t *)XIP_FIXUP(&_dtb_early_pa))
>>>>>>>>>>>> +
>>>>>>>>>>>> +#else
>>>>>>>>>>>> +
>>>>>>>>>>>> +#define dtb_early_va _dtb_early_va
>>>>>>>>>>>> +#define dtb_early_pa _dtb_early_pa
>>>>>>>>>>>> +
>>>>>>>>>>>> +#endif /* CONFIG_XIP_KERNEL */
>>>>>>>>>>>> +
>>>>>>>>>>>> void setup_bootmem(void);
>>>>>>>>>>>> void paging_init(void);
>>>>>>>>>>>> void misc_mem_init(void);
>>>>>>>>>>>> diff --git a/arch/riscv/kernel/cpu_ops_sbi.c
>>>>>>>>>>>> b/arch/riscv/kernel/cpu_ops_sbi.c
>>>>>>>>>>>> index 685fae72b7f5..2413c2997350 100644
>>>>>>>>>>>> --- a/arch/riscv/kernel/cpu_ops_sbi.c
>>>>>>>>>>>> +++ b/arch/riscv/kernel/cpu_ops_sbi.c
>>>>>>>>>>>> @@ -53,10 +53,19 @@ static int sbi_hsm_hart_get_status(unsigned
>>>>>>>>>>>> long hartid)
>>>>>>>>>>>> }
>>>>>>>>>>>> #endif
>>>>>>>>>>>>
>>>>>>>>>>>> +static inline unsigned long get_secondary_start_phys(void)
>>>>>>>>>>>> +{
>>>>>>>>>>>> +#ifdef CONFIG_XIP_KERNEL
>>>>>>>>>>>> + return XIP_PHYS_ADDR(secondary_start_sbi);
>>>>>>>>>>>> +#else
>>>>>>>>>>>> + return __pa_symbol(secondary_start_sbi);
>>>>>>>>>>>> +#endif
>>>>>>>>>>>> +}
>>>>>>>>>>>> +
>>>>>>>>>>>> static int sbi_cpu_start(unsigned int cpuid, struct task_struct
>>>>>>>>>>>> *tidle)
>>>>>>>>>>>> {
>>>>>>>>>>>> int rc;
>>>>>>>>>>>> - unsigned long boot_addr = __pa_symbol(secondary_start_sbi);
>>>>>>>>>>>> + unsigned long boot_addr = get_secondary_start_phys();
>>>>>>>>>>>> int hartid = cpuid_to_hartid_map(cpuid);
>>>>>>>>>>>>
>>>>>>>>>>>> cpu_update_secondary_bootdata(cpuid, tidle);
>>>>>>>>>>>> diff --git a/arch/riscv/kernel/head.S b/arch/riscv/kernel/head.S
>>>>>>>>>>>> index f5a9bad86e58..bbe74e37914f 100644
>>>>>>>>>>>> --- a/arch/riscv/kernel/head.S
>>>>>>>>>>>> +++ b/arch/riscv/kernel/head.S
>>>>>>>>>>>> @@ -9,11 +9,23 @@
>>>>>>>>>>>> #include <linux/linkage.h>
>>>>>>>>>>>> #include <asm/thread_info.h>
>>>>>>>>>>>> #include <asm/page.h>
>>>>>>>>>>>> +#include <asm/pgtable.h>
>>>>>>>>>>>> #include <asm/csr.h>
>>>>>>>>>>>> #include <asm/hwcap.h>
>>>>>>>>>>>> #include <asm/image.h>
>>>>>>>>>>>> #include "efi-header.S"
>>>>>>>>>>>>
>>>>>>>>>>>> +#ifdef CONFIG_XIP_KERNEL
>>>>>>>>>>>> +.macro XIP_FIXUP_OFFSET reg
>>>>>>>>>>>> + REG_L t0, _xip_fixup
>>>>>>>>>>>> + add \reg, \reg, t0
>>>>>>>>>>>> +.endm
>>>>>>>>>>>> +_xip_fixup: .dword CONFIG_PHYS_RAM_BASE - CONFIG_XIP_PHYS_ADDR -
>>>>>>>>>>>> XIP_OFFSET
>>>>>>>>>>>> +#else
>>>>>>>>>>>> +.macro XIP_FIXUP_OFFSET reg
>>>>>>>>>>>> +.endm
>>>>>>>>>>>> +#endif /* CONFIG_XIP_KERNEL */
>>>>>>>>>>>> +
>>>>>>>>>>>> __HEAD
>>>>>>>>>>>> ENTRY(_start)
>>>>>>>>>>>> /*
>>>>>>>>>>>> @@ -69,7 +81,11 @@ pe_head_start:
>>>>>>>>>>>> #ifdef CONFIG_MMU
>>>>>>>>>>>> relocate:
>>>>>>>>>>>> /* Relocate return address */
>>>>>>>>>>>> +#ifdef CONFIG_XIP_KERNEL
>>>>>>>>>>>> + li a1, XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR)
>>>>>>>>>>>> +#else
>>>>>>>>>>>> li a1, PAGE_OFFSET
>>>>>>>>>>>> +#endif
>>>>>>>>>>>> la a2, _start
>>>>>>>>>>>> sub a1, a1, a2
>>>>>>>>>>>> add ra, ra, a1
>>>>>>>>>>>> @@ -91,6 +107,7 @@ relocate:
>>>>>>>>>>>> * to ensure the new translations are in use.
>>>>>>>>>>>> */
>>>>>>>>>>>> la a0, trampoline_pg_dir
>>>>>>>>>>>> + XIP_FIXUP_OFFSET a0
>>>>>>>>>>>> srl a0, a0, PAGE_SHIFT
>>>>>>>>>>>> or a0, a0, a1
>>>>>>>>>>>> sfence.vma
>>>>>>>>>>>> @@ -144,7 +161,9 @@ secondary_start_sbi:
>>>>>>>>>>>>
>>>>>>>>>>>> slli a3, a0, LGREG
>>>>>>>>>>>> la a4, __cpu_up_stack_pointer
>>>>>>>>>>>> + XIP_FIXUP_OFFSET a4
>>>>>>>>>>>> la a5, __cpu_up_task_pointer
>>>>>>>>>>>> + XIP_FIXUP_OFFSET a5
>>>>>>>>>>>> add a4, a3, a4
>>>>>>>>>>>> add a5, a3, a5
>>>>>>>>>>>> REG_L sp, (a4)
>>>>>>>>>>>> @@ -156,6 +175,7 @@ secondary_start_common:
>>>>>>>>>>>> #ifdef CONFIG_MMU
>>>>>>>>>>>> /* Enable virtual memory and relocate to virtual
>>>>>>>>>>>> address */
>>>>>>>>>>>> la a0, swapper_pg_dir
>>>>>>>>>>>> + XIP_FIXUP_OFFSET a0
>>>>>>>>>>>> call relocate
>>>>>>>>>>>> #endif
>>>>>>>>>>>> call setup_trap_vector
>>>>>>>>>>>> @@ -236,12 +256,33 @@ pmp_done:
>>>>>>>>>>>> .Lgood_cores:
>>>>>>>>>>>> #endif
>>>>>>>>>>>>
>>>>>>>>>>>> +#ifndef CONFIG_XIP_KERNEL
>>>>>>>>>>>> /* Pick one hart to run the main boot sequence */
>>>>>>>>>>>> la a3, hart_lottery
>>>>>>>>>>>> li a2, 1
>>>>>>>>>>>> amoadd.w a3, a2, (a3)
>>>>>>>>>>>> bnez a3, .Lsecondary_start
>>>>>>>>>>>>
>>>>>>>>>>>> +#else
>>>>>>>>>>>> + /* hart_lottery in flash contains a magic number */
>>>>>>>>>>>> + la a3, hart_lottery
>>>>>>>>>>>> + mv a2, a3
>>>>>>>>>>>> + XIP_FIXUP_OFFSET a2
>>>>>>>>>>>> + lw t1, (a3)
>>>>>>>>>>>> + amoswap.w t0, t1, (a2)
>>>>>>>>>>>> + /* first time here if hart_lottery in RAM is not set */
>>>>>>>>>>>> + beq t0, t1, .Lsecondary_start
>>>>>>>>>>>> +
>>>>>>>>>>>> + la sp, _end + THREAD_SIZE
>>>>>>>>>>>> + XIP_FIXUP_OFFSET sp
>>>>>>>>>>>> + mv s0, a0
>>>>>>>>>>>> + call __copy_data
>>>>>>>>>>>> +
>>>>>>>>>>>> + /* Restore a0 copy */
>>>>>>>>>>>> + mv a0, s0
>>>>>>>>>>>> +#endif
>>>>>>>>>>>> +
>>>>>>>>>>>> +#ifndef CONFIG_XIP_KERNEL
>>>>>>>>>>>> /* Clear BSS for flat non-ELF images */
>>>>>>>>>>>> la a3, __bss_start
>>>>>>>>>>>> la a4, __bss_stop
>>>>>>>>>>>> @@ -251,15 +292,18 @@ clear_bss:
>>>>>>>>>>>> add a3, a3, RISCV_SZPTR
>>>>>>>>>>>> blt a3, a4, clear_bss
>>>>>>>>>>>> clear_bss_done:
>>>>>>>>>>>> -
>>>>>>>>>>>> +#endif
>>>>>>>>>>>> /* Save hart ID and DTB physical address */
>>>>>>>>>>>> mv s0, a0
>>>>>>>>>>>> mv s1, a1
>>>>>>>>>>>> +
>>>>>>>>>>>> la a2, boot_cpu_hartid
>>>>>>>>>>>> + XIP_FIXUP_OFFSET a2
>>>>>>>>>>>> REG_S a0, (a2)
>>>>>>>>>>>>
>>>>>>>>>>>> /* Initialize page tables and relocate to virtual
>>>>>>>>>>>> addresses */
>>>>>>>>>>>> la sp, init_thread_union + THREAD_SIZE
>>>>>>>>>>>> + XIP_FIXUP_OFFSET sp
>>>>>>>>>>>> #ifdef CONFIG_BUILTIN_DTB
>>>>>>>>>>>> la a0, __dtb_start
>>>>>>>>>>>> #else
>>>>>>>>>>>> @@ -268,6 +312,7 @@ clear_bss_done:
>>>>>>>>>>>> call setup_vm
>>>>>>>>>>>> #ifdef CONFIG_MMU
>>>>>>>>>>>> la a0, early_pg_dir
>>>>>>>>>>>> + XIP_FIXUP_OFFSET a0
>>>>>>>>>>>> call relocate
>>>>>>>>>>>> #endif /* CONFIG_MMU */
>>>>>>>>>>>>
>>>>>>>>>>>> @@ -292,7 +337,9 @@ clear_bss_done:
>>>>>>>>>>>>
>>>>>>>>>>>> slli a3, a0, LGREG
>>>>>>>>>>>> la a1, __cpu_up_stack_pointer
>>>>>>>>>>>> + XIP_FIXUP_OFFSET a1
>>>>>>>>>>>> la a2, __cpu_up_task_pointer
>>>>>>>>>>>> + XIP_FIXUP_OFFSET a2
>>>>>>>>>>>> add a1, a3, a1
>>>>>>>>>>>> add a2, a3, a2
>>>>>>>>>>>>
>>>>>>>>>>>> diff --git a/arch/riscv/kernel/head.h b/arch/riscv/kernel/head.h
>>>>>>>>>>>> index b48dda3d04f6..aabbc3ac3e48 100644
>>>>>>>>>>>> --- a/arch/riscv/kernel/head.h
>>>>>>>>>>>> +++ b/arch/riscv/kernel/head.h
>>>>>>>>>>>> @@ -12,6 +12,9 @@ extern atomic_t hart_lottery;
>>>>>>>>>>>>
>>>>>>>>>>>> asmlinkage void do_page_fault(struct pt_regs *regs);
>>>>>>>>>>>> asmlinkage void __init setup_vm(uintptr_t dtb_pa);
>>>>>>>>>>>> +#ifdef CONFIG_XIP_KERNEL
>>>>>>>>>>>> +asmlinkage void __init __copy_data(void);
>>>>>>>>>>>> +#endif
>>>>>>>>>>>>
>>>>>>>>>>>> extern void *__cpu_up_stack_pointer[];
>>>>>>>>>>>> extern void *__cpu_up_task_pointer[];
>>>>>>>>>>>> diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
>>>>>>>>>>>> index e85bacff1b50..a0384c72c272 100644
>>>>>>>>>>>> --- a/arch/riscv/kernel/setup.c
>>>>>>>>>>>> +++ b/arch/riscv/kernel/setup.c
>>>>>>>>>>>> @@ -50,7 +50,11 @@ struct screen_info screen_info
>>>>>>>>>>>> __section(".data") = {
>>>>>>>>>>>> * This is used before the kernel initializes the BSS so it
>>>>>>>>>>>> can't be in the
>>>>>>>>>>>> * BSS.
>>>>>>>>>>>> */
>>>>>>>>>>>> -atomic_t hart_lottery __section(".sdata");
>>>>>>>>>>>> +atomic_t hart_lottery __section(".sdata")
>>>>>>>>>>>> +#ifdef CONFIG_XIP_KERNEL
>>>>>>>>>>>> += ATOMIC_INIT(0xC001BEEF)
>>>>>>>>>>>> +#endif
>>>>>>>>>>>> +;
>>>>>>>>>>>> unsigned long boot_cpu_hartid;
>>>>>>>>>>>> static DEFINE_PER_CPU(struct cpu, cpu_devices);
>>>>>>>>>>>>
>>>>>>>>>>>> @@ -254,7 +258,7 @@ void __init setup_arch(char **cmdline_p)
>>>>>>>>>>>> #if IS_ENABLED(CONFIG_BUILTIN_DTB)
>>>>>>>>>>>> unflatten_and_copy_device_tree();
>>>>>>>>>>>> #else
>>>>>>>>>>>> - if (early_init_dt_verify(__va(dtb_early_pa)))
>>>>>>>>>>>> + if (early_init_dt_verify(__va(XIP_FIXUP(dtb_early_pa))))
>>>>>>>>>>>> unflatten_device_tree();
>>>>>>>>>>>> else
>>>>>>>>>>>> pr_err("No DTB found in kernel mappings\n");
>>>>>>>>>>>> diff --git a/arch/riscv/kernel/vmlinux-xip.lds.S
>>>>>>>>>>>> b/arch/riscv/kernel/vmlinux-xip.lds.S
>>>>>>>>>>>> new file mode 100644
>>>>>>>>>>>> index 000000000000..9f0f08c34cd3
>>>>>>>>>>>> --- /dev/null
>>>>>>>>>>>> +++ b/arch/riscv/kernel/vmlinux-xip.lds.S
>>>>>>>>>>>> @@ -0,0 +1,132 @@
>>>>>>>>>>>> +/* SPDX-License-Identifier: GPL-2.0-only */
>>>>>>>>>>>> +/*
>>>>>>>>>>>> + * Copyright (C) 2012 Regents of the University of California
>>>>>>>>>>>> + * Copyright (C) 2017 SiFive
>>>>>>>>>>>> + * Copyright (C) 2020 Vitaly Wool, Konsulko AB
>>>>>>>>>>>> + */
>>>>>>>>>>>> +
>>>>>>>>>>>> +#define LOAD_OFFSET XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR)
>>>>>>>>>>>> +/* No __ro_after_init data in the .rodata section - which will
>>>>>>>>>>>> always be ro */
>>>>>>>>>>>> +#define RO_AFTER_INIT_DATA
>>>>>>>>>>>> +
>>>>>>>>>>>> +#include <asm/vmlinux.lds.h>
>>>>>>>>>>>> +#include <asm/page.h>
>>>>>>>>>>>> +#include <asm/pgtable.h>
>>>>>>>>>>>> +#include <asm/cache.h>
>>>>>>>>>>>> +#include <asm/thread_info.h>
>>>>>>>>>>>> +
>>>>>>>>>>>> +OUTPUT_ARCH(riscv)
>>>>>>>>>>>> +ENTRY(_start)
>>>>>>>>>>>> +
>>>>>>>>>>>> +jiffies = jiffies_64;
>>>>>>>>>>>> +
>>>>>>>>>>>> +SECTIONS
>>>>>>>>>>>> +{
>>>>>>>>>>>> + /* Beginning of code and text segment */
>>>>>>>>>>>> + . = XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR);
>>>>>>>>>>>> + _xiprom = .;
>>>>>>>>>>>> + _start = .;
>>>>>>>>>>>> + HEAD_TEXT_SECTION
>>>>>>>>>>>> + INIT_TEXT_SECTION(PAGE_SIZE)
>>>>>>>>>>>> + /* we have to discard exit text and such at runtime, not
>>>>>>>>>>>> link time */
>>>>>>>>>>>> + .exit.text :
>>>>>>>>>>>> + {
>>>>>>>>>>>> + EXIT_TEXT
>>>>>>>>>>>> + }
>>>>>>>>>>>> +
>>>>>>>>>>>> + .text : {
>>>>>>>>>>>> + _text = .;
>>>>>>>>>>>> + _stext = .;
>>>>>>>>>>>> + TEXT_TEXT
>>>>>>>>>>>> + SCHED_TEXT
>>>>>>>>>>>> + CPUIDLE_TEXT
>>>>>>>>>>>> + LOCK_TEXT
>>>>>>>>>>>> + KPROBES_TEXT
>>>>>>>>>>>> + ENTRY_TEXT
>>>>>>>>>>>> + IRQENTRY_TEXT
>>>>>>>>>>>> + SOFTIRQENTRY_TEXT
>>>>>>>>>>>> + *(.fixup)
>>>>>>>>>>>> + _etext = .;
>>>>>>>>>>>> + }
>>>>>>>>>>>> + RO_DATA(L1_CACHE_BYTES)
>>>>>>>>>>>> + .srodata : {
>>>>>>>>>>>> + *(.srodata*)
>>>>>>>>>>>> + }
>>>>>>>>>>>> + .init.rodata : {
>>>>>>>>>>>> + INIT_SETUP(16)
>>>>>>>>>>>> + INIT_CALLS
>>>>>>>>>>>> + CON_INITCALL
>>>>>>>>>>>> + INIT_RAM_FS
>>>>>>>>>>>> + }
>>>>>>>>>>>> + _exiprom = .; /* End of XIP ROM area */
>>>>>>>>>>>> +
>>>>>>>>>>>> +
>>>>>>>>>>>> +/*
>>>>>>>>>>>> + * From this point, stuff is considered writable and will be
>>>>>>>>>>>> copied to RAM
>>>>>>>>>>>> + */
>>>>>>>>>>>> + __data_loc = ALIGN(16); /* location in file */
>>>>>>>>>>>> + . = PAGE_OFFSET; /* location in memory */
>>>>>>>>>>>> +
>>>>>>>>>>>> + _sdata = .; /* Start of data section */
>>>>>>>>>>>> + _data = .;
>>>>>>>>>>>> + RW_DATA(L1_CACHE_BYTES, PAGE_SIZE, THREAD_SIZE)
>>>>>>>>>>>> + _edata = .;
>>>>>>>>>>>> + __start_ro_after_init = .;
>>>>>>>>>>>> + .data.ro_after_init : AT(ADDR(.data.ro_after_init) -
>>>>>>>>>>>> LOAD_OFFSET) {
>>>>>>>>>>>> + *(.data..ro_after_init)
>>>>>>>>>>>> + }
>>>>>>>>>>>> + __end_ro_after_init = .;
>>>>>>>>>>>> +
>>>>>>>>>>>> + . = ALIGN(PAGE_SIZE);
>>>>>>>>>>>> + __init_begin = .;
>>>>>>>>>>>> + .init.data : {
>>>>>>>>>>>> + INIT_DATA
>>>>>>>>>>>> + }
>>>>>>>>>>>> + .exit.data : {
>>>>>>>>>>>> + EXIT_DATA
>>>>>>>>>>>> + }
>>>>>>>>>>>> + . = ALIGN(8);
>>>>>>>>>>>> + __soc_early_init_table : {
>>>>>>>>>>>> + __soc_early_init_table_start = .;
>>>>>>>>>>>> + KEEP(*(__soc_early_init_table))
>>>>>>>>>>>> + __soc_early_init_table_end = .;
>>>>>>>>>>>> + }
>>>>>>>>>>>> + __soc_builtin_dtb_table : {
>>>>>>>>>>>> + __soc_builtin_dtb_table_start = .;
>>>>>>>>>>>> + KEEP(*(__soc_builtin_dtb_table))
>>>>>>>>>>>> + __soc_builtin_dtb_table_end = .;
>>>>>>>>>>>> + }
>>>>>>>>>>>> + PERCPU_SECTION(L1_CACHE_BYTES)
>>>>>>>>>>>> +
>>>>>>>>>>>> + . = ALIGN(PAGE_SIZE);
>>>>>>>>>>>> + __init_end = .;
>>>>>>>>>>>> +
>>>>>>>>>>>> + .sdata : {
>>>>>>>>>>>> + __global_pointer$ = . + 0x800;
>>>>>>>>>>>> + *(.sdata*)
>>>>>>>>>>>> + *(.sbss*)
>>>>>>>>>>>> + }
>>>>>>>>>>>> +
>>>>>>>>>>>> + BSS_SECTION(PAGE_SIZE, PAGE_SIZE, 0)
>>>>>>>>>>>> + EXCEPTION_TABLE(0x10)
>>>>>>>>>>>> +
>>>>>>>>>>>> + .rel.dyn : AT(ADDR(.rel.dyn) - LOAD_OFFSET) {
>>>>>>>>>>>> + *(.rel.dyn*)
>>>>>>>>>>>> + }
>>>>>>>>>>>> +
>>>>>>>>>>>> + /*
>>>>>>>>>>>> + * End of copied data. We need a dummy section to get its
>>>>>>>>>>>> LMA.
>>>>>>>>>>>> + * Also located before final ALIGN() as trailing padding is
>>>>>>>>>>>> not stored
>>>>>>>>>>>> + * in the resulting binary file and useless to copy.
>>>>>>>>>>>> + */
>>>>>>>>>>>> + .data.endmark : AT(ADDR(.data.endmark) - LOAD_OFFSET) { }
>>>>>>>>>>>> + _edata_loc = LOADADDR(.data.endmark);
>>>>>>>>>>>> +
>>>>>>>>>>>> + . = ALIGN(PAGE_SIZE);
>>>>>>>>>>>> + _end = .;
>>>>>>>>>>>> +
>>>>>>>>>>>> + STABS_DEBUG
>>>>>>>>>>>> + DWARF_DEBUG
>>>>>>>>>>>> +
>>>>>>>>>>>> + DISCARDS
>>>>>>>>>>>> +}
>>>>>>>>>>>> diff --git a/arch/riscv/kernel/vmlinux.lds.S
>>>>>>>>>>>> b/arch/riscv/kernel/vmlinux.lds.S
>>>>>>>>>>>> index de03cb22d0e9..6745ec325930 100644
>>>>>>>>>>>> --- a/arch/riscv/kernel/vmlinux.lds.S
>>>>>>>>>>>> +++ b/arch/riscv/kernel/vmlinux.lds.S
>>>>>>>>>>>> @@ -4,7 +4,12 @@
>>>>>>>>>>>> * Copyright (C) 2017 SiFive
>>>>>>>>>>>> */
>>>>>>>>>>>>
>>>>>>>>>>>> +#ifdef CONFIG_XIP_KERNEL
>>>>>>>>>>>> +#include "vmlinux-xip.lds.S"
>>>>>>>>>>>> +#else
>>>>>>>>>>>> +
>>>>>>>>>>>> #define LOAD_OFFSET PAGE_OFFSET
>>>>>>>>>>>> +
>>>>>>>>>>>> #include <asm/vmlinux.lds.h>
>>>>>>>>>>>> #include <asm/page.h>
>>>>>>>>>>>> #include <asm/cache.h>
>>>>>>>>>>>> @@ -132,3 +137,4 @@ SECTIONS
>>>>>>>>>>>>
>>>>>>>>>>>> DISCARDS
>>>>>>>>>>>> }
>>>>>>>>>>>> +#endif /* CONFIG_XIP_KERNEL */
>>>>>>>>>>>> diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
>>>>>>>>>>>> index 7f5036fbee8c..efe649d41f95 100644
>>>>>>>>>>>> --- a/arch/riscv/mm/init.c
>>>>>>>>>>>> +++ b/arch/riscv/mm/init.c
>>>>>>>>>>>> @@ -31,8 +31,8 @@ EXPORT_SYMBOL(empty_zero_page);
>>>>>>>>>>>>
>>>>>>>>>>>> extern char _start[];
>>>>>>>>>>>> #define DTB_EARLY_BASE_VA PGDIR_SIZE
>>>>>>>>>>>> -void *dtb_early_va __initdata;
>>>>>>>>>>>> -uintptr_t dtb_early_pa __initdata;
>>>>>>>>>>>> +void *_dtb_early_va __initdata;
>>>>>>>>>>>> +uintptr_t _dtb_early_pa __initdata;
>>>>>>>>>>>>
>>>>>>>>>>>> struct pt_alloc_ops {
>>>>>>>>>>>> pte_t *(*get_pte_virt)(phys_addr_t pa);
>>>>>>>>>>>> @@ -88,6 +88,10 @@ static void print_vm_layout(void)
>>>>>>>>>>>> (unsigned long)VMALLOC_END);
>>>>>>>>>>>> print_mlm("lowmem", (unsigned long)PAGE_OFFSET,
>>>>>>>>>>>> (unsigned long)high_memory);
>>>>>>>>>>>> +#ifdef CONFIG_XIP_KERNEL
>>>>>>>>>>>> + print_mlm("xip", (unsigned long)XIP_VIRT_ADDR_START,
>>>>>>>>>>>> + (unsigned long)XIP_VIRT_ADDR_START + SZ_16M);
>>>>>>>>>>>> +#endif /* CONFIG_XIP_KERNEL */
>>>>>>>>>>>> }
>>>>>>>>>>>> #else
>>>>>>>>>>>> static void print_vm_layout(void) { }
>>>>>>>>>>>> @@ -113,6 +117,10 @@ void __init setup_bootmem(void)
>>>>>>>>>>>> phys_addr_t dram_end = memblock_end_of_DRAM();
>>>>>>>>>>>> phys_addr_t max_mapped_addr = __pa(~(ulong)0);
>>>>>>>>>>>>
>>>>>>>>>>>> +#ifdef CONFIG_XIP_KERNEL
>>>>>>>>>>>> + vmlinux_start = __pa_symbol(&_sdata);
>>>>>>>>>>>> +#endif
>>>>>>>>>>>> +
>>>>>>>>>>>> /* The maximal physical memory size is -PAGE_OFFSET. */
>>>>>>>>>>>> memblock_enforce_memory_limit(-PAGE_OFFSET);
>>>>>>>>>>>>
>>>>>>>>>>>> @@ -149,11 +157,27 @@ void __init setup_bootmem(void)
>>>>>>>>>>>> memblock_allow_resize();
>>>>>>>>>>>> }
>>>>>>>>>>>>
>>>>>>>>>>>> +#ifdef CONFIG_XIP_KERNEL
>>>>>>>>>>>> +
>>>>>>>>>>>> +extern char _xiprom[], _exiprom[];
>>>>>>>>>>>> +extern char _sdata[], _edata[];
>>>>>>>>>>>> +
>>>>>>>>>>>> +#endif /* CONFIG_XIP_KERNEL */
>>>>>>>>>>>> +
>>>>>>>>>>>> #ifdef CONFIG_MMU
>>>>>>>>>>>> -static struct pt_alloc_ops pt_ops;
>>>>>>>>>>>> +static struct pt_alloc_ops _pt_ops;
>>>>>>>>>>>> +
>>>>>>>>>>>> +#ifdef CONFIG_XIP_KERNEL
>>>>>>>>>>>> +#define pt_ops (*(struct pt_alloc_ops *)XIP_FIXUP(&_pt_ops))
>>>>>>>>>>>> +#else
>>>>>>>>>>>> +#define pt_ops _pt_ops
>>>>>>>>>>>> +#endif
>>>>>>>>>>>>
>>>>>>>>>>>> unsigned long va_pa_offset;
>>>>>>>>>>>> EXPORT_SYMBOL(va_pa_offset);
>>>>>>>>>>>> +#ifdef CONFIG_XIP_KERNEL
>>>>>>>>>>>> +#define va_pa_offset (*((unsigned long
>>>>>>>>>>>> *)XIP_FIXUP(&va_pa_offset)))
>>>>>>>>>>>> +#endif
>>>>>>>>>>>> unsigned long pfn_base;
>>>>>>>>>>>> EXPORT_SYMBOL(pfn_base);
>>>>>>>>>>>>
>>>>>>>>>>>> @@ -163,6 +187,12 @@ pte_t fixmap_pte[PTRS_PER_PTE]
>>>>>>>>>>>> __page_aligned_bss;
>>>>>>>>>>>>
>>>>>>>>>>>> pgd_t early_pg_dir[PTRS_PER_PGD] __initdata
>>>>>>>>>>>> __aligned(PAGE_SIZE);
>>>>>>>>>>>>
>>>>>>>>>>>> +#ifdef CONFIG_XIP_KERNEL
>>>>>>>>>>>> +#define trampoline_pg_dir ((pgd_t
>>>>>>>>>>>> *)XIP_FIXUP(trampoline_pg_dir))
>>>>>>>>>>>> +#define fixmap_pte ((pte_t *)XIP_FIXUP(fixmap_pte))
>>>>>>>>>>>> +#define early_pg_dir ((pgd_t *)XIP_FIXUP(early_pg_dir))
>>>>>>>>>>>> +#endif /* CONFIG_XIP_KERNEL */
>>>>>>>>>>>> +
>>>>>>>>>>>> void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys,
>>>>>>>>>>>> pgprot_t prot)
>>>>>>>>>>>> {
>>>>>>>>>>>> unsigned long addr = __fix_to_virt(idx);
>>>>>>>>>>>> @@ -238,6 +268,15 @@ pmd_t fixmap_pmd[PTRS_PER_PMD]
>>>>>>>>>>>> __page_aligned_bss;
>>>>>>>>>>>> pmd_t early_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
>>>>>>>>>>>> pmd_t early_dtb_pmd[PTRS_PER_PMD] __initdata
>>>>>>>>>>>> __aligned(PAGE_SIZE);
>>>>>>>>>>>>
>>>>>>>>>>>> +#ifdef CONFIG_XIP_KERNEL
>>>>>>>>>>>> +pmd_t xip_pmd[PTRS_PER_PMD] __page_aligned_bss;
>>>>>>>>>>>> +
>>>>>>>>>>>> +#define trampoline_pmd ((pmd_t *)XIP_FIXUP(trampoline_pmd))
>>>>>>>>>>>> +#define fixmap_pmd ((pmd_t *)XIP_FIXUP(fixmap_pmd))
>>>>>>>>>>>> +#define xip_pmd ((pmd_t *)XIP_FIXUP(xip_pmd))
>>>>>>>>>>>> +#define early_pmd ((pmd_t *)XIP_FIXUP(early_pmd))
>>>>>>>>>>>> +#endif /* CONFIG_XIP_KERNEL */
>>>>>>>>>>>> +
>>>>>>>>>>>> static pmd_t *__init get_pmd_virt_early(phys_addr_t pa)
>>>>>>>>>>>> {
>>>>>>>>>>>> /* Before MMU is enabled */
>>>>>>>>>>>> @@ -354,6 +393,19 @@ static uintptr_t __init
>>>>>>>>>>>> best_map_size(phys_addr_t base, phys_addr_t size)
>>>>>>>>>>>> return PMD_SIZE;
>>>>>>>>>>>> }
>>>>>>>>>>>>
>>>>>>>>>>>> +#ifdef CONFIG_XIP_KERNEL
>>>>>>>>>>>> +/* called from head.S with MMU off */
>>>>>>>>>>>> +asmlinkage void __init __copy_data(void)
>>>>>>>>>>>> +{
>>>>>>>>>>>> + void *from = (void *)(&_sdata);
>>>>>>>>>>>> + void *end = (void *)(&_end);
>>>>>>>>>>>> + void *to = (void *)CONFIG_PHYS_RAM_BASE;
>>>>>>>>>>>> + size_t sz = (size_t)(end - from);
>>>>>>>>>>>> +
>>>>>>>>>>>> + memcpy(to, from, sz);
>>>>>>>>>>>> +}
>>>>>>>>>>>> +#endif
>>>>>>>>>>>> +
>>>>>>>>>>>> /*
>>>>>>>>>>>> * setup_vm() is called from head.S with MMU-off.
>>>>>>>>>>>> *
>>>>>>>>>>>> @@ -374,7 +426,8 @@ static uintptr_t __init
>>>>>>>>>>>> best_map_size(phys_addr_t base, phys_addr_t size)
>>>>>>>>>>>>
>>>>>>>>>>>> asmlinkage void __init setup_vm(uintptr_t dtb_pa)
>>>>>>>>>>>> {
>>>>>>>>>>>> - uintptr_t va, pa, end_va;
>>>>>>>>>>>> + uintptr_t va, end_va;
>>>>>>>>>>>> + uintptr_t __maybe_unused pa;
>>>>>>>>>>>> uintptr_t load_pa = (uintptr_t)(&_start);
>>>>>>>>>>>> uintptr_t load_sz = (uintptr_t)(&_end) - load_pa;
>>>>>>>>>>>> uintptr_t map_size;
>>>>>>>>>>>> @@ -382,6 +435,13 @@ asmlinkage void __init setup_vm(uintptr_t
>>>>>>>>>>>> dtb_pa)
>>>>>>>>>>>> pmd_t fix_bmap_spmd, fix_bmap_epmd;
>>>>>>>>>>>> #endif
>>>>>>>>>>>>
>>>>>>>>>>>> +#ifdef CONFIG_XIP_KERNEL
>>>>>>>>>>>> + uintptr_t xiprom = (uintptr_t)CONFIG_XIP_PHYS_ADDR;
>>>>>>>>>>>> + uintptr_t xiprom_sz = (uintptr_t)(&_exiprom) -
>>>>>>>>>>>> (uintptr_t)(&_xiprom);
>>>>>>>>>>>> +
>>>>>>>>>>>> + load_pa = (uintptr_t)CONFIG_PHYS_RAM_BASE;
>>>>>>>>>>>> + load_sz = (uintptr_t)(&_end) - (uintptr_t)(&_sdata);
>>>>>>>>>>>> +#endif
>>>>>>>>>>>> va_pa_offset = PAGE_OFFSET - load_pa;
>>>>>>>>>
>>>>>>>>> I should have seen this before, I was too focused on having a XIP
>>>>>>>>> kernel
>>>>>>>>> boot. I already moved the kernel mapping in the vmalloc zone: the
>>>>>>>>> virtual to physical translations need to be handled differently
>>>>>>>>> now that
>>>>>>>>> the kernel mapping does not lie into linear mapping anymore, we can't
>>>>>>>>> use va_pa_offset defined above for both mappings.
>>>>>>>>>
>>>>>>>>> I was rebasing my patchset on the XIP patch but I believe that
>>>>>>>>> doing the
>>>>>>>>> other way around would greatly simplify the XIP patch as the kernel
>>>>>>>>> mapping would already be moved outside the linear mapping, there
>>>>>>>>> would
>>>>>>>>> be no need to reserve a zone in vmalloc anymore (that simplifies
>>>>>>>>> pgtable.h quite a lot). And the XIP kernel mapping could be
>>>>>>>>> implemented
>>>>>>>>> in a new create_kernel_page_table (that would also simplify
>>>>>>>>> mm/init.c).
>>>>>>>>>
>>>>>>>>> I can help to do that but I don't think we should merge this patch
>>>>>>>>> as is
>>>>>>>>> now.
>>>>>>>>
>>>>>>>> I think that's the right way to go for now: it's a lot harder to test
>>>>>>>> the XIP stuff, as it requires a bunch of harness changes. So let's
>>>>>>>> take the page table refactoring in now and rebase this stuff on top of
>>>>>>>> it. There's really no way to do both without making more work for
>>>>>>>> someone, it's just a headache on timing.
>>>>>>>>
>>>>>>>> Alex: if you want to sign up to spend some time there that'd be great,
>>>>>>>> otherwise I will.
>>>>>>>
>>>>>>> I can take care of that, no problem.
>>>>>>
>>>>>> Vitaly, can you try the branch int/alex/riscv_xip_kernel_rebase_v1 at
>>>>>> https://github.com/AlexGhiti/riscv-linux ? This boots fine using my
>>>>>> setup.
>>>>>>
>>>>>> I removed most of the pgtable.h stuff, the XIP kernel is now mapped like
>>>>>> any other kernel at the end of the address space, not in the vmalloc
>>>>>> zone as you proposed. And I fixed a few thigns along the way (pfn_base,
>>>>>> pfn_valid, copy_data and other stuff).
>>>>>>
>>>>>> Any comment is welcome !
>>>>>
>>>>> thanks for your efforts!
>>>>>
>>>>> I've just built your version. The build went well, but the image
>>>>> doesn't seem to boot for me.
>>>>
>>>> Too bad. Can you give me your config please ?
>>>>
>>>
>>> Apparently, as you can see below, your config works for me, at least it
>>> reaches userspace. Do you have traces or more info about what is wrong ?
>>
>> Console output is just the same but it stops after the following line:
>> [ 0.003208] Console: colour dummy device 80x25
>>
>> I did some very simplistic debugging bisecting start_kernel()
>> execution and I could see that setup_per_cpu_pageset() was reached
>> while calibrate_delay() was not.
>>
>> How (and whether) this might be related to XIP I don't know :)
>
> A short update: the system would hang in sched_clock_init() if run
> with 'go 21000000' command.
The output I pasted came from a boot using 'go', I can't make 'booti'
work in my setup.
And you don't have this issue with your patch right ?
Can you give me any config that could allow me to reproduce this
(uboot/buildroot) ? And your qemu version ?
Thanks,
> If I use 'booti' command it passes and goes further all the way to
> mounting the userspace
>
> So the problem is rather SMP related than XIP related.
>
> Best regards,
> Vitaly
>
>>> Thanks!
>>>
>>> [ 0.000000] Linux version 5.12.0-rc2 (alex@...ian)
>>> (riscv64-buildroot-linux-gnu-gcc.br_real (Buildroot 2020.11.2) 9.3.0,
>>> GNU ld (GNU Binutils) 2.34) #322 SMP Sat Apr 3 05:50:18 EDT 2021
>>> [ 0.000000] Machine model: Microchip PolarFire-SoC Icicle Kit
>>> [ 0.000000] earlycon: sbi0 at I/O port 0x0 (options '')
>>> [ 0.000000] printk: bootconsole [sbi0] enabled
>>> [ 0.000000] Zone ranges:
>>> [ 0.000000] DMA32 [mem 0x0000000080000000-0x00000000bfffffff]
>>> [ 0.000000] Normal empty
>>> [ 0.000000] Movable zone start for each node
>>> [ 0.000000] Early memory node ranges
>>> [ 0.000000] node 0: [mem 0x0000000080000000-0x00000000bfffffff]
>>> [ 0.000000] Initmem setup node 0 [mem
>>> 0x0000000080000000-0x00000000bfffffff]
>>> [ 0.000000] On node 0 totalpages: 262144
>>> [ 0.000000] DMA32 zone: 3584 pages used for memmap
>>> [ 0.000000] DMA32 zone: 0 pages reserved
>>> [ 0.000000] DMA32 zone: 262144 pages, LIFO batch:63
>>> [ 0.000000] SBI specification v0.2 detected
>>> [ 0.000000] SBI implementation ID=0x1 Version=0x6
>>> [ 0.000000] SBI v0.2 TIME extension detected
>>> [ 0.000000] SBI v0.2 IPI extension detected
>>> [ 0.000000] SBI v0.2 RFENCE extension detected
>>> [ 0.000000] software IO TLB: mapped [mem
>>> 0x00000000b9e00000-0x00000000bde00000] (64MB)
>>> [ 0.000000] CPU with hartid=0 is not available
>>> [ 0.000000] CPU with hartid=0 is not available
>>> [ 0.000000] riscv: ISA extensions acdfim
>>> [ 0.000000] riscv: ELF capabilities acdfim
>>> [ 0.000000] percpu: Embedded 17 pages/cpu s29856 r8192 d31584 u69632
>>> [ 0.000000] pcpu-alloc: s29856 r8192 d31584 u69632 alloc=17*4096
>>> [ 0.000000] pcpu-alloc: [0] 0 [0] 1 [0] 2 [0] 3
>>> [ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 258560
>>> [ 0.000000] Kernel command line: earlyprintk debug earlycon=sbi
>>> console=ttyS0,115200n8 root=/dev/ram0 init=/sbin/init
>>> [ 0.000000] Dentry cache hash table entries: 131072 (order: 8,
>>> 1048576 bytes, linear)
>>> [ 0.000000] Inode-cache hash table entries: 65536 (order: 7, 524288
>>> bytes, linear)
>>> [ 0.000000] Sorting __ex_table...
>>> [ 0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
>>> [ 0.000000] Memory: 947732K/1048576K available (2999K kernel code,
>>> 692K rwdata, 953K rodata, 205K init, 247K bss, 100844K reserved, 0K
>>> cma-reserved)
>>> [ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
>>> [ 0.000000] rcu: Hierarchical RCU implementation.
>>> [ 0.000000] rcu: RCU restricting CPUs from NR_CPUS=8 to nr_cpu_ids=4.
>>> [ 0.000000] rcu: RCU debug extended QS entry/exit.
>>> [ 0.000000] Tracing variant of Tasks RCU enabled.
>>> [ 0.000000] rcu: RCU calculated value of scheduler-enlistment delay
>>> is 25 jiffies.
>>> [ 0.000000] rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=4
>>> [ 0.000000] NR_IRQS: 64, nr_irqs: 64, preallocated irqs: 0
>>> [ 0.000000] CPU with hartid=0 is not available
>>> [ 0.000000] riscv-intc: unable to find hart id for
>>> /cpus/cpu@...nterrupt-controller
>>> [ 0.000000] riscv-intc: 64 local interrupts mapped
>>> [ 0.000000] plic: interrupt-controller@...0000: mapped 186 interrupts
>>> with 4 handlers for 9 contexts.
>>> [ 0.000000] random: get_random_bytes called from
>>> start_kernel+0x2fe/0x49c with crng_init=0
>>> [ 0.000000] riscv_timer_init_dt: Registering clocksource cpuid [0]
>>> hartid [1]
>>> [ 0.000000] clocksource: riscv_clocksource: mask: 0xffffffffffffffff
>>> max_cycles: 0x1d854df40, max_idle_ns: 3526361616960 ns
>>> [ 0.000146] sched_clock: 64 bits at 1000kHz, resolution 1000ns, wraps
>>> every 2199023255500ns
>>> [ 0.006056] Console: colour dummy device 80x25
>>> [ 0.015242] Calibrating delay loop (skipped), value calculated using
>>> timer frequency.. 2.00 BogoMIPS (lpj=4000)
>>> [ 0.017130] pid_max: default: 32768 minimum: 301
>>> [ 0.020115] Mount-cache hash table entries: 2048 (order: 2, 16384
>>> bytes, linear)
>>> [ 0.021097] Mountpoint-cache hash table entries: 2048 (order: 2,
>>> 16384 bytes, linear)
>>> [ 0.078755] ASID allocator using 16 bits (65536 entries)
>>> [ 0.083669] rcu: Hierarchical SRCU implementation.
>>> [ 0.093304] smp: Bringing up secondary CPUs ...
>>> [ 1.149900] CPU1: failed to come online
>>> [ 2.204183] CPU2: failed to come online
>>> [ 3.256211] CPU3: failed to come online
>>> [ 3.257043] smp: Brought up 1 node, 1 CPU
>>> [ 3.269554] devtmpfs: initialized
>>> [ 3.282015] clocksource: jiffies: mask: 0xffffffff max_cycles:
>>> 0xffffffff, max_idle_ns: 7645041785100000 ns
>>> [ 3.283484] futex hash table entries: 1024 (order: 4, 65536 bytes,
>>> linear)
>>> [ 3.381718] SCSI subsystem initialized
>>> [ 3.385115] clocksource: Switched to clocksource riscv_clocksource
>>> [ 3.602198] workingset: timestamp_bits=62 max_order=18 bucket_order=0
>>> [ 3.624182] Block layer SCSI generic (bsg) driver version 0.4 loaded
>>> (major 253)
>>> [ 3.625988] io scheduler mq-deadline registered
>>> [ 3.626725] io scheduler kyber registered
>>> [ 3.629047] start plist test
>>> [ 3.641420] end plist test
>>> [ 3.717639] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
>>> [ 3.752315] brd: module loaded
>>> [ 3.790207] loop: module loaded
>>> [ 3.793943] mousedev: PS/2 mouse device common for all mice
>>> [ 3.810511] Warning: unable to open an initial console.
>>> [ 3.811923] Freeing unused kernel memory: 88K
>>> [ 3.812558] This architecture does not have kernel memory protection.
>>> [ 3.814280] Run /init as init process
>>> [ 3.814808] with arguments:
>>> [ 3.815227] /init
>>> [ 3.815539] with environment:
>>> [ 3.815924] HOME=/
>>> [ 3.816250] TERM=linux
>>> [ 4.398678] random: dd: uninitialized urandom read (512 bytes read)
>>>
>>>
>>>> Thanks,
>>>>
>>>> Alex
>>>>
>>>>> I'll take a look at the code later today.
>>>>>
>>>>> Best regards,
>>>>> Vitaly
>>>>>
>>>>>> Thanks,
>>>>>>
>>>>>> Alex
>>>>>>
>>>>>>>
>>>>>>>> Either way, can you point me (either just indicate the old version is
>>>>>>>> OK or send a new one) to what you want me to look at WRT the page
>>>>>>>> table code? IIRC it looked pretty much fine, but I'll take another
>>>>>>>> look ASAP so we can avoid serializing everything.
>>>>>>>
>>>>>>> The v3 is fine for me:
>>>>>>> https://patchwork.kernel.org/project/linux-riscv/list/?series=447699
>>>>>>>
>>>>>>>>
>>>>>>>>>
>>>>>>>>> Alex
>>>>>>>>>
>>>>>>>>>>>> pfn_base = PFN_DOWN(load_pa);
>>>>>>>>>>>>
>>>>>>>>>>>> @@ -420,6 +480,21 @@ asmlinkage void __init setup_vm(uintptr_t
>>>>>>>>>>>> dtb_pa)
>>>>>>>>>>>> load_pa, PGDIR_SIZE, PAGE_KERNEL_EXEC);
>>>>>>>>>>>> #endif
>>>>>>>>>>>>
>>>>>>>>>>>> +#ifdef CONFIG_XIP_KERNEL
>>>>>>>>>>>> + create_pgd_mapping(trampoline_pg_dir, XIP_VIRT_ADDR_START,
>>>>>>>>>>>> + (uintptr_t)xip_pmd, PGDIR_SIZE,
>>>>>>>>>>>> PAGE_TABLE);
>>>>>>>>>>>> + for (va = XIP_VIRT_ADDR_START;
>>>>>>>>>>>> + va < XIP_VIRT_ADDR_START + xiprom_sz;
>>>>>>>>>>>> + va += PMD_SIZE) {
>>>>>>>>>>>> + create_pmd_mapping(xip_pmd, va,
>>>>>>>>>>>> + xiprom + (va -
>>>>>>>>>>>> XIP_VIRT_ADDR_START),
>>>>>>>>>>>> + PMD_SIZE, PAGE_KERNEL_EXEC);
>>>>>>>>>>>> + }
>>>>>>>>>>>> +
>>>>>>>>>>>> + create_pgd_mapping(early_pg_dir, XIP_VIRT_ADDR_START,
>>>>>>>>>>>> + (uintptr_t)xip_pmd, PGDIR_SIZE,
>>>>>>>>>>>> PAGE_TABLE);
>>>>>>>>>>>> +#endif
>>>>>>>>>>>> +
>>>>>>>>>>>> /*
>>>>>>>>>>>> * Setup early PGD covering entire kernel which will
>>>>>>>>>>>> allows
>>>>>>>>>>>> * us to reach paging_init(). We map all memory banks
>>>>>>>>>>>> later
>>>>>>>>>>>> @@ -444,7 +519,7 @@ asmlinkage void __init setup_vm(uintptr_t
>>>>>>>>>>>> dtb_pa)
>>>>>>>>>>>> pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL);
>>>>>>>>>>>> dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa &
>>>>>>>>>>>> (PMD_SIZE - 1));
>>>>>>>>>>>> #else /* CONFIG_BUILTIN_DTB */
>>>>>>>>>>>> - dtb_early_va = __va(dtb_pa);
>>>>>>>>>>>> + dtb_early_va = __va(XIP_FIXUP(dtb_pa));
>>>>>>>>>>>> #endif /* CONFIG_BUILTIN_DTB */
>>>>>>>>>>>> #else
>>>>>>>>>>>> #ifndef CONFIG_BUILTIN_DTB
>>>>>>>>>>>> @@ -456,7 +531,7 @@ asmlinkage void __init setup_vm(uintptr_t
>>>>>>>>>>>> dtb_pa)
>>>>>>>>>>>> pa + PGDIR_SIZE, PGDIR_SIZE,
>>>>>>>>>>>> PAGE_KERNEL);
>>>>>>>>>>>> dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa &
>>>>>>>>>>>> (PGDIR_SIZE - 1));
>>>>>>>>>>>> #else /* CONFIG_BUILTIN_DTB */
>>>>>>>>>>>> - dtb_early_va = __va(dtb_pa);
>>>>>>>>>>>> + dtb_early_va = __va(XIP_FIXUP(dtb_pa));
>>>>>>>>>>>> #endif /* CONFIG_BUILTIN_DTB */
>>>>>>>>>>>> #endif
>>>>>>>>>>>> dtb_early_pa = dtb_pa;
>>>>>>>>>>>> @@ -497,6 +572,9 @@ static void __init setup_vm_final(void)
>>>>>>>>>>>> uintptr_t va, map_size;
>>>>>>>>>>>> phys_addr_t pa, start, end;
>>>>>>>>>>>> u64 i;
>>>>>>>>>>>> +#ifdef CONFIG_XIP_KERNEL
>>>>>>>>>>>> + uintptr_t xiprom_sz = (uintptr_t)(&_exiprom) -
>>>>>>>>>>>> (uintptr_t)(&_xiprom);
>>>>>>>>>>>> +#endif
>>>>>>>>>>>>
>>>>>>>>>>>> /**
>>>>>>>>>>>> * MMU is enabled at this point. But page table setup is
>>>>>>>>>>>> not complete yet.
>>>>>>>>>>>> @@ -528,6 +606,16 @@ static void __init setup_vm_final(void)
>>>>>>>>>>>> map_size,
>>>>>>>>>>>> PAGE_KERNEL_EXEC);
>>>>>>>>>>>> }
>>>>>>>>>>>> }
>>>>>>>>>>>> +#ifdef CONFIG_XIP_KERNEL
>>>>>>>>>>>> + map_size = best_map_size(CONFIG_XIP_PHYS_ADDR, xiprom_sz);
>>>>>>>>>>>> + for (va = XIP_VIRT_ADDR_START;
>>>>>>>>>>>> + va < XIP_VIRT_ADDR_START + xiprom_sz;
>>>>>>>>>>>> + va += map_size)
>>>>>>>>>>>> + create_pgd_mapping(swapper_pg_dir, va,
>>>>>>>>>>>> + CONFIG_XIP_PHYS_ADDR + (va -
>>>>>>>>>>>> XIP_VIRT_ADDR_START),
>>>>>>>>>>>> + map_size, PAGE_KERNEL_EXEC);
>>>>>>>>>>>> +
>>>>>>>>>>>> +#endif
>>>>>>>>>>>>
>>>>>>>>>>>> /* Clear fixmap PTE and PMD mappings */
>>>>>>>>>>>> clear_fixmap(FIX_PTE);
>>>>>>>>>>
>>>>>>>>>> _______________________________________________
>>>>>>>>>> linux-riscv mailing list
>>>>>>>>>> linux-riscv@...ts.infradead.org
>>>>>>>>>> http://lists.infradead.org/mailman/listinfo/linux-riscv
>>>>>>>>>>
>>>>>>>>
>>>>>>>> _______________________________________________
>>>>>>>> linux-riscv mailing list
>>>>>>>> linux-riscv@...ts.infradead.org
>>>>>>>> http://lists.infradead.org/mailman/listinfo/linux-riscv
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> linux-riscv mailing list
>>>>>>> linux-riscv@...ts.infradead.org
>>>>>>> http://lists.infradead.org/mailman/listinfo/linux-riscv
>>>>>
>>>>> _______________________________________________
>>>>> linux-riscv mailing list
>>>>> linux-riscv@...ts.infradead.org
>>>>> http://lists.infradead.org/mailman/listinfo/linux-riscv
>>>>>
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