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Message-ID: <e9f469a257db6f2a562f6d5ade983087eb6c9fbc.1716815901.git.christophe.leroy@csgroup.eu>
Date: Mon, 27 May 2024 15:29:59 +0200
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: Andrew Morton <akpm@...ux-foundation.org>,
Jason Gunthorpe <jgg@...dia.com>,
Peter Xu <peterx@...hat.com>,
Oscar Salvador <osalvador@...e.de>,
Michael Ellerman <mpe@...erman.id.au>,
Nicholas Piggin <npiggin@...il.com>
Cc: Christophe Leroy <christophe.leroy@...roup.eu>,
linux-kernel@...r.kernel.org,
linux-mm@...ck.org,
linuxppc-dev@...ts.ozlabs.org
Subject: [RFC PATCH v4 01/16] powerpc/64e: Remove unused IBM HTW code [SQUASHED]
From: Michael Ellerman <mpe@...erman.id.au>
This is a squash of series from Michael https://patchwork.ozlabs.org/project/linuxppc-dev/patch/20240524073141.1637736-1-mpe@ellerman.id.au/
The nohash HTW_IBM (Hardware Table Walk) code is unused since support
for A2 was removed in commit fb5a515704d7 ("powerpc: Remove platforms/
wsp and associated pieces") (2014).
The remaining supported CPUs use either no HTW (data_tlb_miss_bolted),
or the e6500 HTW (data_tlb_miss_e6500).
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
powerpc/64e: Split out nohash Book3E 64-bit code
A reasonable chunk of nohash/tlb.c is 64-bit only code, split it out
into a separate file.
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
powerpc/64e: Drop E500 ifdefs in 64-bit code
All 64-bit Book3E have E500=y, so drop the unneeded ifdefs.
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
powerpc/64e: Drop MMU_FTR_TYPE_FSL_E checks in 64-bit code
All 64-bit Book3E have MMU_FTR_TYPE_FSL_E, since A2 was removed, so
remove checks for it in 64-bit only code.
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
powerpc/64e: Consolidate TLB miss handler patching
The 64e TLB miss handler patching is done in setup_mmu_htw(), and then
again immediately afterward in early_init_mmu_global(). Consolidate it
into a single location.
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
powerpc/64e: Drop unused TLB miss handlers
There are two possibilities for book3e_htw_mode, PPC_HTW_E6500 or
PPC_HTW_NONE.
The TLB miss handlers are patched to use, respectively:
- exc_[data|indstruction]_tlb_miss_e6500_book3e
- exc_[data|indstruction]_tlb_miss_bolted_book3e
Which means the default handlers are never used. Remove those, and use
the bolted handlers (PPC_HTW_NONE) by default.
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
arch/powerpc/include/asm/nohash/mmu-e500.h | 3 +-
arch/powerpc/kernel/exceptions-64e.S | 4 +-
arch/powerpc/kernel/setup_64.c | 6 +-
arch/powerpc/mm/nohash/Makefile | 2 +-
arch/powerpc/mm/nohash/tlb.c | 398 +------------------
arch/powerpc/mm/nohash/tlb_64e.c | 314 +++++++++++++++
arch/powerpc/mm/nohash/tlb_low_64e.S | 421 ---------------------
7 files changed, 320 insertions(+), 828 deletions(-)
create mode 100644 arch/powerpc/mm/nohash/tlb_64e.c
diff --git a/arch/powerpc/include/asm/nohash/mmu-e500.h b/arch/powerpc/include/asm/nohash/mmu-e500.h
index 6ddced0415cb..7dc24b8632d7 100644
--- a/arch/powerpc/include/asm/nohash/mmu-e500.h
+++ b/arch/powerpc/include/asm/nohash/mmu-e500.h
@@ -303,8 +303,7 @@ extern unsigned long linear_map_top;
extern int book3e_htw_mode;
#define PPC_HTW_NONE 0
-#define PPC_HTW_IBM 1
-#define PPC_HTW_E6500 2
+#define PPC_HTW_E6500 1
/*
* 64-bit booke platforms don't load the tlb in the tlb miss handler code.
diff --git a/arch/powerpc/kernel/exceptions-64e.S b/arch/powerpc/kernel/exceptions-64e.S
index dcf0591ad3c2..63f6b9f513a4 100644
--- a/arch/powerpc/kernel/exceptions-64e.S
+++ b/arch/powerpc/kernel/exceptions-64e.S
@@ -485,8 +485,8 @@ interrupt_base_book3e: /* fake trap */
EXCEPTION_STUB(0x160, decrementer) /* 0x0900 */
EXCEPTION_STUB(0x180, fixed_interval) /* 0x0980 */
EXCEPTION_STUB(0x1a0, watchdog) /* 0x09f0 */
- EXCEPTION_STUB(0x1c0, data_tlb_miss)
- EXCEPTION_STUB(0x1e0, instruction_tlb_miss)
+ EXCEPTION_STUB(0x1c0, data_tlb_miss_bolted)
+ EXCEPTION_STUB(0x1e0, instruction_tlb_miss_bolted)
EXCEPTION_STUB(0x200, altivec_unavailable)
EXCEPTION_STUB(0x220, altivec_assist)
EXCEPTION_STUB(0x260, perfmon)
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index ae36a129789f..22f83fbbc762 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -696,11 +696,7 @@ __init u64 ppc64_bolted_size(void)
{
#ifdef CONFIG_PPC_BOOK3E_64
/* Freescale BookE bolts the entire linear mapping */
- /* XXX: BookE ppc64_rma_limit setup seems to disagree? */
- if (early_mmu_has_feature(MMU_FTR_TYPE_FSL_E))
- return linear_map_top;
- /* Other BookE, we assume the first GB is bolted */
- return 1ul << 30;
+ return linear_map_top;
#else
/* BookS radix, does not take faults on linear mapping */
if (early_radix_enabled())
diff --git a/arch/powerpc/mm/nohash/Makefile b/arch/powerpc/mm/nohash/Makefile
index b3f0498dd42f..90e846f0c46c 100644
--- a/arch/powerpc/mm/nohash/Makefile
+++ b/arch/powerpc/mm/nohash/Makefile
@@ -1,7 +1,7 @@
# SPDX-License-Identifier: GPL-2.0
obj-y += mmu_context.o tlb.o tlb_low.o kup.o
-obj-$(CONFIG_PPC_BOOK3E_64) += tlb_low_64e.o book3e_pgtable.o
+obj-$(CONFIG_PPC_BOOK3E_64) += tlb_64e.o tlb_low_64e.o book3e_pgtable.o
obj-$(CONFIG_40x) += 40x.o
obj-$(CONFIG_44x) += 44x.o
obj-$(CONFIG_PPC_8xx) += 8xx.o
diff --git a/arch/powerpc/mm/nohash/tlb.c b/arch/powerpc/mm/nohash/tlb.c
index 5ffa0af4328a..f57dc721d063 100644
--- a/arch/powerpc/mm/nohash/tlb.c
+++ b/arch/powerpc/mm/nohash/tlb.c
@@ -110,28 +110,6 @@ struct mmu_psize_def mmu_psize_defs[MMU_PAGE_COUNT] = {
};
#endif
-/* The variables below are currently only used on 64-bit Book3E
- * though this will probably be made common with other nohash
- * implementations at some point
- */
-#ifdef CONFIG_PPC64
-
-int mmu_pte_psize; /* Page size used for PTE pages */
-int mmu_vmemmap_psize; /* Page size used for the virtual mem map */
-int book3e_htw_mode; /* HW tablewalk? Value is PPC_HTW_* */
-unsigned long linear_map_top; /* Top of linear mapping */
-
-
-/*
- * Number of bytes to add to SPRN_SPRG_TLB_EXFRAME on crit/mcheck/debug
- * exceptions. This is used for bolted and e6500 TLB miss handlers which
- * do not modify this SPRG in the TLB miss code; for other TLB miss handlers,
- * this is set to zero.
- */
-int extlb_level_exc;
-
-#endif /* CONFIG_PPC64 */
-
#ifdef CONFIG_PPC_E500
/* next_tlbcam_idx is used to round-robin tlbcam entry assignment */
DEFINE_PER_CPU(int, next_tlbcam_idx);
@@ -358,381 +336,7 @@ void tlb_flush(struct mmu_gather *tlb)
flush_tlb_mm(tlb->mm);
}
-/*
- * Below are functions specific to the 64-bit variant of Book3E though that
- * may change in the future
- */
-
-#ifdef CONFIG_PPC64
-
-/*
- * Handling of virtual linear page tables or indirect TLB entries
- * flushing when PTE pages are freed
- */
-void tlb_flush_pgtable(struct mmu_gather *tlb, unsigned long address)
-{
- int tsize = mmu_psize_defs[mmu_pte_psize].enc;
-
- if (book3e_htw_mode != PPC_HTW_NONE) {
- unsigned long start = address & PMD_MASK;
- unsigned long end = address + PMD_SIZE;
- unsigned long size = 1UL << mmu_psize_defs[mmu_pte_psize].shift;
-
- /* This isn't the most optimal, ideally we would factor out the
- * while preempt & CPU mask mucking around, or even the IPI but
- * it will do for now
- */
- while (start < end) {
- __flush_tlb_page(tlb->mm, start, tsize, 1);
- start += size;
- }
- } else {
- unsigned long rmask = 0xf000000000000000ul;
- unsigned long rid = (address & rmask) | 0x1000000000000000ul;
- unsigned long vpte = address & ~rmask;
-
- vpte = (vpte >> (PAGE_SHIFT - 3)) & ~0xffful;
- vpte |= rid;
- __flush_tlb_page(tlb->mm, vpte, tsize, 0);
- }
-}
-
-static void __init setup_page_sizes(void)
-{
- unsigned int tlb0cfg;
- unsigned int tlb0ps;
- unsigned int eptcfg;
- int i, psize;
-
-#ifdef CONFIG_PPC_E500
- unsigned int mmucfg = mfspr(SPRN_MMUCFG);
- int fsl_mmu = mmu_has_feature(MMU_FTR_TYPE_FSL_E);
-
- if (fsl_mmu && (mmucfg & MMUCFG_MAVN) == MMUCFG_MAVN_V1) {
- unsigned int tlb1cfg = mfspr(SPRN_TLB1CFG);
- unsigned int min_pg, max_pg;
-
- min_pg = (tlb1cfg & TLBnCFG_MINSIZE) >> TLBnCFG_MINSIZE_SHIFT;
- max_pg = (tlb1cfg & TLBnCFG_MAXSIZE) >> TLBnCFG_MAXSIZE_SHIFT;
-
- for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) {
- struct mmu_psize_def *def;
- unsigned int shift;
-
- def = &mmu_psize_defs[psize];
- shift = def->shift;
-
- if (shift == 0 || shift & 1)
- continue;
-
- /* adjust to be in terms of 4^shift Kb */
- shift = (shift - 10) >> 1;
-
- if ((shift >= min_pg) && (shift <= max_pg))
- def->flags |= MMU_PAGE_SIZE_DIRECT;
- }
-
- goto out;
- }
-
- if (fsl_mmu && (mmucfg & MMUCFG_MAVN) == MMUCFG_MAVN_V2) {
- u32 tlb1cfg, tlb1ps;
-
- tlb0cfg = mfspr(SPRN_TLB0CFG);
- tlb1cfg = mfspr(SPRN_TLB1CFG);
- tlb1ps = mfspr(SPRN_TLB1PS);
- eptcfg = mfspr(SPRN_EPTCFG);
-
- if ((tlb1cfg & TLBnCFG_IND) && (tlb0cfg & TLBnCFG_PT))
- book3e_htw_mode = PPC_HTW_E6500;
-
- /*
- * We expect 4K subpage size and unrestricted indirect size.
- * The lack of a restriction on indirect size is a Freescale
- * extension, indicated by PSn = 0 but SPSn != 0.
- */
- if (eptcfg != 2)
- book3e_htw_mode = PPC_HTW_NONE;
-
- for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) {
- struct mmu_psize_def *def = &mmu_psize_defs[psize];
-
- if (!def->shift)
- continue;
-
- if (tlb1ps & (1U << (def->shift - 10))) {
- def->flags |= MMU_PAGE_SIZE_DIRECT;
-
- if (book3e_htw_mode && psize == MMU_PAGE_2M)
- def->flags |= MMU_PAGE_SIZE_INDIRECT;
- }
- }
-
- goto out;
- }
-#endif
-
- tlb0cfg = mfspr(SPRN_TLB0CFG);
- tlb0ps = mfspr(SPRN_TLB0PS);
- eptcfg = mfspr(SPRN_EPTCFG);
-
- /* Look for supported direct sizes */
- for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) {
- struct mmu_psize_def *def = &mmu_psize_defs[psize];
-
- if (tlb0ps & (1U << (def->shift - 10)))
- def->flags |= MMU_PAGE_SIZE_DIRECT;
- }
-
- /* Indirect page sizes supported ? */
- if ((tlb0cfg & TLBnCFG_IND) == 0 ||
- (tlb0cfg & TLBnCFG_PT) == 0)
- goto out;
-
- book3e_htw_mode = PPC_HTW_IBM;
-
- /* Now, we only deal with one IND page size for each
- * direct size. Hopefully all implementations today are
- * unambiguous, but we might want to be careful in the
- * future.
- */
- for (i = 0; i < 3; i++) {
- unsigned int ps, sps;
-
- sps = eptcfg & 0x1f;
- eptcfg >>= 5;
- ps = eptcfg & 0x1f;
- eptcfg >>= 5;
- if (!ps || !sps)
- continue;
- for (psize = 0; psize < MMU_PAGE_COUNT; psize++) {
- struct mmu_psize_def *def = &mmu_psize_defs[psize];
-
- if (ps == (def->shift - 10))
- def->flags |= MMU_PAGE_SIZE_INDIRECT;
- if (sps == (def->shift - 10))
- def->ind = ps + 10;
- }
- }
-
-out:
- /* Cleanup array and print summary */
- pr_info("MMU: Supported page sizes\n");
- for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) {
- struct mmu_psize_def *def = &mmu_psize_defs[psize];
- const char *__page_type_names[] = {
- "unsupported",
- "direct",
- "indirect",
- "direct & indirect"
- };
- if (def->flags == 0) {
- def->shift = 0;
- continue;
- }
- pr_info(" %8ld KB as %s\n", 1ul << (def->shift - 10),
- __page_type_names[def->flags & 0x3]);
- }
-}
-
-static void __init setup_mmu_htw(void)
-{
- /*
- * If we want to use HW tablewalk, enable it by patching the TLB miss
- * handlers to branch to the one dedicated to it.
- */
-
- switch (book3e_htw_mode) {
- case PPC_HTW_IBM:
- patch_exception(0x1c0, exc_data_tlb_miss_htw_book3e);
- patch_exception(0x1e0, exc_instruction_tlb_miss_htw_book3e);
- break;
-#ifdef CONFIG_PPC_E500
- case PPC_HTW_E6500:
- extlb_level_exc = EX_TLB_SIZE;
- patch_exception(0x1c0, exc_data_tlb_miss_e6500_book3e);
- patch_exception(0x1e0, exc_instruction_tlb_miss_e6500_book3e);
- break;
-#endif
- }
- pr_info("MMU: Book3E HW tablewalk %s\n",
- book3e_htw_mode != PPC_HTW_NONE ? "enabled" : "not supported");
-}
-
-/*
- * Early initialization of the MMU TLB code
- */
-static void early_init_this_mmu(void)
-{
- unsigned int mas4;
-
- /* Set MAS4 based on page table setting */
-
- mas4 = 0x4 << MAS4_WIMGED_SHIFT;
- switch (book3e_htw_mode) {
- case PPC_HTW_E6500:
- mas4 |= MAS4_INDD;
- mas4 |= BOOK3E_PAGESZ_2M << MAS4_TSIZED_SHIFT;
- mas4 |= MAS4_TLBSELD(1);
- mmu_pte_psize = MMU_PAGE_2M;
- break;
-
- case PPC_HTW_IBM:
- mas4 |= MAS4_INDD;
- mas4 |= BOOK3E_PAGESZ_1M << MAS4_TSIZED_SHIFT;
- mmu_pte_psize = MMU_PAGE_1M;
- break;
-
- case PPC_HTW_NONE:
- mas4 |= BOOK3E_PAGESZ_4K << MAS4_TSIZED_SHIFT;
- mmu_pte_psize = mmu_virtual_psize;
- break;
- }
- mtspr(SPRN_MAS4, mas4);
-
-#ifdef CONFIG_PPC_E500
- if (mmu_has_feature(MMU_FTR_TYPE_FSL_E)) {
- unsigned int num_cams;
- bool map = true;
-
- /* use a quarter of the TLBCAM for bolted linear map */
- num_cams = (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) / 4;
-
- /*
- * Only do the mapping once per core, or else the
- * transient mapping would cause problems.
- */
-#ifdef CONFIG_SMP
- if (hweight32(get_tensr()) > 1)
- map = false;
-#endif
-
- if (map)
- linear_map_top = map_mem_in_cams(linear_map_top,
- num_cams, false, true);
- }
-#endif
-
- /* A sync won't hurt us after mucking around with
- * the MMU configuration
- */
- mb();
-}
-
-static void __init early_init_mmu_global(void)
-{
- /* XXX This should be decided at runtime based on supported
- * page sizes in the TLB, but for now let's assume 16M is
- * always there and a good fit (which it probably is)
- *
- * Freescale booke only supports 4K pages in TLB0, so use that.
- */
- if (mmu_has_feature(MMU_FTR_TYPE_FSL_E))
- mmu_vmemmap_psize = MMU_PAGE_4K;
- else
- mmu_vmemmap_psize = MMU_PAGE_16M;
-
- /* XXX This code only checks for TLB 0 capabilities and doesn't
- * check what page size combos are supported by the HW. It
- * also doesn't handle the case where a separate array holds
- * the IND entries from the array loaded by the PT.
- */
- /* Look for supported page sizes */
- setup_page_sizes();
-
- /* Look for HW tablewalk support */
- setup_mmu_htw();
-
-#ifdef CONFIG_PPC_E500
- if (mmu_has_feature(MMU_FTR_TYPE_FSL_E)) {
- if (book3e_htw_mode == PPC_HTW_NONE) {
- extlb_level_exc = EX_TLB_SIZE;
- patch_exception(0x1c0, exc_data_tlb_miss_bolted_book3e);
- patch_exception(0x1e0,
- exc_instruction_tlb_miss_bolted_book3e);
- }
- }
-#endif
-
- /* Set the global containing the top of the linear mapping
- * for use by the TLB miss code
- */
- linear_map_top = memblock_end_of_DRAM();
-
- ioremap_bot = IOREMAP_BASE;
-}
-
-static void __init early_mmu_set_memory_limit(void)
-{
-#ifdef CONFIG_PPC_E500
- if (mmu_has_feature(MMU_FTR_TYPE_FSL_E)) {
- /*
- * Limit memory so we dont have linear faults.
- * Unlike memblock_set_current_limit, which limits
- * memory available during early boot, this permanently
- * reduces the memory available to Linux. We need to
- * do this because highmem is not supported on 64-bit.
- */
- memblock_enforce_memory_limit(linear_map_top);
- }
-#endif
-
- memblock_set_current_limit(linear_map_top);
-}
-
-/* boot cpu only */
-void __init early_init_mmu(void)
-{
- early_init_mmu_global();
- early_init_this_mmu();
- early_mmu_set_memory_limit();
-}
-
-void early_init_mmu_secondary(void)
-{
- early_init_this_mmu();
-}
-
-void setup_initial_memory_limit(phys_addr_t first_memblock_base,
- phys_addr_t first_memblock_size)
-{
- /* On non-FSL Embedded 64-bit, we adjust the RMA size to match
- * the bolted TLB entry. We know for now that only 1G
- * entries are supported though that may eventually
- * change.
- *
- * on FSL Embedded 64-bit, usually all RAM is bolted, but with
- * unusual memory sizes it's possible for some RAM to not be mapped
- * (such RAM is not used at all by Linux, since we don't support
- * highmem on 64-bit). We limit ppc64_rma_size to what would be
- * mappable if this memblock is the only one. Additional memblocks
- * can only increase, not decrease, the amount that ends up getting
- * mapped. We still limit max to 1G even if we'll eventually map
- * more. This is due to what the early init code is set up to do.
- *
- * We crop it to the size of the first MEMBLOCK to
- * avoid going over total available memory just in case...
- */
-#ifdef CONFIG_PPC_E500
- if (early_mmu_has_feature(MMU_FTR_TYPE_FSL_E)) {
- unsigned long linear_sz;
- unsigned int num_cams;
-
- /* use a quarter of the TLBCAM for bolted linear map */
- num_cams = (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) / 4;
-
- linear_sz = map_mem_in_cams(first_memblock_size, num_cams,
- true, true);
-
- ppc64_rma_size = min_t(u64, linear_sz, 0x40000000);
- } else
-#endif
- ppc64_rma_size = min_t(u64, first_memblock_size, 0x40000000);
-
- /* Finally limit subsequent allocations */
- memblock_set_current_limit(first_memblock_base + ppc64_rma_size);
-}
-#else /* ! CONFIG_PPC64 */
+#ifndef CONFIG_PPC64
void __init early_init_mmu(void)
{
unsigned long root = of_get_flat_dt_root();
diff --git a/arch/powerpc/mm/nohash/tlb_64e.c b/arch/powerpc/mm/nohash/tlb_64e.c
new file mode 100644
index 000000000000..053128a5636c
--- /dev/null
+++ b/arch/powerpc/mm/nohash/tlb_64e.c
@@ -0,0 +1,314 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright 2008,2009 Ben Herrenschmidt <benh@...nel.crashing.org>
+ * IBM Corp.
+ *
+ * Derived from arch/ppc/mm/init.c:
+ * Copyright (C) 1995-1996 Gary Thomas (gdt@...uxppc.org)
+ *
+ * Modifications by Paul Mackerras (PowerMac) (paulus@...anu.edu.au)
+ * and Cort Dougan (PReP) (cort@...nmt.edu)
+ * Copyright (C) 1996 Paul Mackerras
+ *
+ * Derived from "arch/i386/mm/init.c"
+ * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
+ */
+
+#include <linux/kernel.h>
+#include <linux/export.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/pagemap.h>
+#include <linux/memblock.h>
+
+#include <asm/pgalloc.h>
+#include <asm/tlbflush.h>
+#include <asm/tlb.h>
+#include <asm/code-patching.h>
+#include <asm/cputhreads.h>
+
+#include <mm/mmu_decl.h>
+
+/* The variables below are currently only used on 64-bit Book3E
+ * though this will probably be made common with other nohash
+ * implementations at some point
+ */
+int mmu_pte_psize; /* Page size used for PTE pages */
+int mmu_vmemmap_psize; /* Page size used for the virtual mem map */
+int book3e_htw_mode; /* HW tablewalk? Value is PPC_HTW_* */
+unsigned long linear_map_top; /* Top of linear mapping */
+
+
+/*
+ * Number of bytes to add to SPRN_SPRG_TLB_EXFRAME on crit/mcheck/debug
+ * exceptions. This is used for bolted and e6500 TLB miss handlers which
+ * do not modify this SPRG in the TLB miss code; for other TLB miss handlers,
+ * this is set to zero.
+ */
+int extlb_level_exc;
+
+/*
+ * Handling of virtual linear page tables or indirect TLB entries
+ * flushing when PTE pages are freed
+ */
+void tlb_flush_pgtable(struct mmu_gather *tlb, unsigned long address)
+{
+ int tsize = mmu_psize_defs[mmu_pte_psize].enc;
+
+ if (book3e_htw_mode != PPC_HTW_NONE) {
+ unsigned long start = address & PMD_MASK;
+ unsigned long end = address + PMD_SIZE;
+ unsigned long size = 1UL << mmu_psize_defs[mmu_pte_psize].shift;
+
+ /* This isn't the most optimal, ideally we would factor out the
+ * while preempt & CPU mask mucking around, or even the IPI but
+ * it will do for now
+ */
+ while (start < end) {
+ __flush_tlb_page(tlb->mm, start, tsize, 1);
+ start += size;
+ }
+ } else {
+ unsigned long rmask = 0xf000000000000000ul;
+ unsigned long rid = (address & rmask) | 0x1000000000000000ul;
+ unsigned long vpte = address & ~rmask;
+
+ vpte = (vpte >> (PAGE_SHIFT - 3)) & ~0xffful;
+ vpte |= rid;
+ __flush_tlb_page(tlb->mm, vpte, tsize, 0);
+ }
+}
+
+static void __init setup_page_sizes(void)
+{
+ unsigned int tlb0cfg;
+ unsigned int eptcfg;
+ int psize;
+
+ unsigned int mmucfg = mfspr(SPRN_MMUCFG);
+
+ if ((mmucfg & MMUCFG_MAVN) == MMUCFG_MAVN_V1) {
+ unsigned int tlb1cfg = mfspr(SPRN_TLB1CFG);
+ unsigned int min_pg, max_pg;
+
+ min_pg = (tlb1cfg & TLBnCFG_MINSIZE) >> TLBnCFG_MINSIZE_SHIFT;
+ max_pg = (tlb1cfg & TLBnCFG_MAXSIZE) >> TLBnCFG_MAXSIZE_SHIFT;
+
+ for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) {
+ struct mmu_psize_def *def;
+ unsigned int shift;
+
+ def = &mmu_psize_defs[psize];
+ shift = def->shift;
+
+ if (shift == 0 || shift & 1)
+ continue;
+
+ /* adjust to be in terms of 4^shift Kb */
+ shift = (shift - 10) >> 1;
+
+ if ((shift >= min_pg) && (shift <= max_pg))
+ def->flags |= MMU_PAGE_SIZE_DIRECT;
+ }
+
+ goto out;
+ }
+
+ if ((mmucfg & MMUCFG_MAVN) == MMUCFG_MAVN_V2) {
+ u32 tlb1cfg, tlb1ps;
+
+ tlb0cfg = mfspr(SPRN_TLB0CFG);
+ tlb1cfg = mfspr(SPRN_TLB1CFG);
+ tlb1ps = mfspr(SPRN_TLB1PS);
+ eptcfg = mfspr(SPRN_EPTCFG);
+
+ if ((tlb1cfg & TLBnCFG_IND) && (tlb0cfg & TLBnCFG_PT))
+ book3e_htw_mode = PPC_HTW_E6500;
+
+ /*
+ * We expect 4K subpage size and unrestricted indirect size.
+ * The lack of a restriction on indirect size is a Freescale
+ * extension, indicated by PSn = 0 but SPSn != 0.
+ */
+ if (eptcfg != 2)
+ book3e_htw_mode = PPC_HTW_NONE;
+
+ for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) {
+ struct mmu_psize_def *def = &mmu_psize_defs[psize];
+
+ if (!def->shift)
+ continue;
+
+ if (tlb1ps & (1U << (def->shift - 10))) {
+ def->flags |= MMU_PAGE_SIZE_DIRECT;
+
+ if (book3e_htw_mode && psize == MMU_PAGE_2M)
+ def->flags |= MMU_PAGE_SIZE_INDIRECT;
+ }
+ }
+
+ goto out;
+ }
+out:
+ /* Cleanup array and print summary */
+ pr_info("MMU: Supported page sizes\n");
+ for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) {
+ struct mmu_psize_def *def = &mmu_psize_defs[psize];
+ const char *__page_type_names[] = {
+ "unsupported",
+ "direct",
+ "indirect",
+ "direct & indirect"
+ };
+ if (def->flags == 0) {
+ def->shift = 0;
+ continue;
+ }
+ pr_info(" %8ld KB as %s\n", 1ul << (def->shift - 10),
+ __page_type_names[def->flags & 0x3]);
+ }
+}
+
+/*
+ * Early initialization of the MMU TLB code
+ */
+static void early_init_this_mmu(void)
+{
+ unsigned int mas4;
+
+ /* Set MAS4 based on page table setting */
+
+ mas4 = 0x4 << MAS4_WIMGED_SHIFT;
+ switch (book3e_htw_mode) {
+ case PPC_HTW_E6500:
+ mas4 |= MAS4_INDD;
+ mas4 |= BOOK3E_PAGESZ_2M << MAS4_TSIZED_SHIFT;
+ mas4 |= MAS4_TLBSELD(1);
+ mmu_pte_psize = MMU_PAGE_2M;
+ break;
+
+ case PPC_HTW_NONE:
+ mas4 |= BOOK3E_PAGESZ_4K << MAS4_TSIZED_SHIFT;
+ mmu_pte_psize = mmu_virtual_psize;
+ break;
+ }
+ mtspr(SPRN_MAS4, mas4);
+
+ unsigned int num_cams;
+ bool map = true;
+
+ /* use a quarter of the TLBCAM for bolted linear map */
+ num_cams = (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) / 4;
+
+ /*
+ * Only do the mapping once per core, or else the
+ * transient mapping would cause problems.
+ */
+#ifdef CONFIG_SMP
+ if (hweight32(get_tensr()) > 1)
+ map = false;
+#endif
+
+ if (map)
+ linear_map_top = map_mem_in_cams(linear_map_top,
+ num_cams, false, true);
+
+ /* A sync won't hurt us after mucking around with
+ * the MMU configuration
+ */
+ mb();
+}
+
+static void __init early_init_mmu_global(void)
+{
+ /*
+ * Freescale booke only supports 4K pages in TLB0, so use that.
+ */
+ mmu_vmemmap_psize = MMU_PAGE_4K;
+
+ /* XXX This code only checks for TLB 0 capabilities and doesn't
+ * check what page size combos are supported by the HW. It
+ * also doesn't handle the case where a separate array holds
+ * the IND entries from the array loaded by the PT.
+ */
+ /* Look for supported page sizes */
+ setup_page_sizes();
+
+ /*
+ * If we want to use HW tablewalk, enable it by patching the TLB miss
+ * handlers to branch to the one dedicated to it.
+ */
+ extlb_level_exc = EX_TLB_SIZE;
+ switch (book3e_htw_mode) {
+ case PPC_HTW_E6500:
+ patch_exception(0x1c0, exc_data_tlb_miss_e6500_book3e);
+ patch_exception(0x1e0, exc_instruction_tlb_miss_e6500_book3e);
+ break;
+ }
+
+ pr_info("MMU: Book3E HW tablewalk %s\n",
+ book3e_htw_mode != PPC_HTW_NONE ? "enabled" : "not supported");
+
+ /* Set the global containing the top of the linear mapping
+ * for use by the TLB miss code
+ */
+ linear_map_top = memblock_end_of_DRAM();
+
+ ioremap_bot = IOREMAP_BASE;
+}
+
+static void __init early_mmu_set_memory_limit(void)
+{
+ /*
+ * Limit memory so we dont have linear faults.
+ * Unlike memblock_set_current_limit, which limits
+ * memory available during early boot, this permanently
+ * reduces the memory available to Linux. We need to
+ * do this because highmem is not supported on 64-bit.
+ */
+ memblock_enforce_memory_limit(linear_map_top);
+
+ memblock_set_current_limit(linear_map_top);
+}
+
+/* boot cpu only */
+void __init early_init_mmu(void)
+{
+ early_init_mmu_global();
+ early_init_this_mmu();
+ early_mmu_set_memory_limit();
+}
+
+void early_init_mmu_secondary(void)
+{
+ early_init_this_mmu();
+}
+
+void setup_initial_memory_limit(phys_addr_t first_memblock_base,
+ phys_addr_t first_memblock_size)
+{
+ /*
+ * On FSL Embedded 64-bit, usually all RAM is bolted, but with
+ * unusual memory sizes it's possible for some RAM to not be mapped
+ * (such RAM is not used at all by Linux, since we don't support
+ * highmem on 64-bit). We limit ppc64_rma_size to what would be
+ * mappable if this memblock is the only one. Additional memblocks
+ * can only increase, not decrease, the amount that ends up getting
+ * mapped. We still limit max to 1G even if we'll eventually map
+ * more. This is due to what the early init code is set up to do.
+ *
+ * We crop it to the size of the first MEMBLOCK to
+ * avoid going over total available memory just in case...
+ */
+ unsigned long linear_sz;
+ unsigned int num_cams;
+
+ /* use a quarter of the TLBCAM for bolted linear map */
+ num_cams = (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) / 4;
+
+ linear_sz = map_mem_in_cams(first_memblock_size, num_cams, true, true);
+ ppc64_rma_size = min_t(u64, linear_sz, 0x40000000);
+
+ /* Finally limit subsequent allocations */
+ memblock_set_current_limit(first_memblock_base + ppc64_rma_size);
+}
diff --git a/arch/powerpc/mm/nohash/tlb_low_64e.S b/arch/powerpc/mm/nohash/tlb_low_64e.S
index 7e0b8fe1c279..a54e7d6c3d0b 100644
--- a/arch/powerpc/mm/nohash/tlb_low_64e.S
+++ b/arch/powerpc/mm/nohash/tlb_low_64e.S
@@ -511,232 +511,6 @@ itlb_miss_fault_e6500:
tlb_epilog_bolted
b exc_instruction_storage_book3e
-/**********************************************************************
- * *
- * TLB miss handling for Book3E with TLB reservation and HES support *
- * *
- **********************************************************************/
-
-
-/* Data TLB miss */
- START_EXCEPTION(data_tlb_miss)
- TLB_MISS_PROLOG
-
- /* Now we handle the fault proper. We only save DEAR in normal
- * fault case since that's the only interesting values here.
- * We could probably also optimize by not saving SRR0/1 in the
- * linear mapping case but I'll leave that for later
- */
- mfspr r14,SPRN_ESR
- mfspr r16,SPRN_DEAR /* get faulting address */
- srdi r15,r16,44 /* get region */
- xoris r15,r15,0xc
- cmpldi cr0,r15,0 /* linear mapping ? */
- beq tlb_load_linear /* yes -> go to linear map load */
- cmpldi cr1,r15,1 /* vmalloc mapping ? */
-
- /* The page tables are mapped virtually linear. At this point, though,
- * we don't know whether we are trying to fault in a first level
- * virtual address or a virtual page table address. We can get that
- * from bit 0x1 of the region ID which we have set for a page table
- */
- andis. r10,r15,0x1
- bne- virt_page_table_tlb_miss
-
- std r14,EX_TLB_ESR(r12); /* save ESR */
- std r16,EX_TLB_DEAR(r12); /* save DEAR */
-
- /* We need _PAGE_PRESENT and _PAGE_ACCESSED set */
- li r11,_PAGE_PRESENT
- oris r11,r11,_PAGE_ACCESSED@h
-
- /* We do the user/kernel test for the PID here along with the RW test
- */
- srdi. r15,r16,60 /* Check for user region */
-
- /* We pre-test some combination of permissions to avoid double
- * faults:
- *
- * We move the ESR:ST bit into the position of _PAGE_BAP_SW in the PTE
- * ESR_ST is 0x00800000
- * _PAGE_BAP_SW is 0x00000010
- * So the shift is >> 19. This tests for supervisor writeability.
- * If the page happens to be supervisor writeable and not user
- * writeable, we will take a new fault later, but that should be
- * a rare enough case.
- *
- * We also move ESR_ST in _PAGE_DIRTY position
- * _PAGE_DIRTY is 0x00001000 so the shift is >> 11
- *
- * MAS1 is preset for all we need except for TID that needs to
- * be cleared for kernel translations
- */
- rlwimi r11,r14,32-19,27,27
- rlwimi r11,r14,32-16,19,19
- beq normal_tlb_miss_user
- /* XXX replace the RMW cycles with immediate loads + writes */
-1: mfspr r10,SPRN_MAS1
- rlwinm r10,r10,0,16,1 /* Clear TID */
- mtspr SPRN_MAS1,r10
- beq+ cr1,normal_tlb_miss
-
- /* We got a crappy address, just fault with whatever DEAR and ESR
- * are here
- */
- TLB_MISS_EPILOG_ERROR
- b exc_data_storage_book3e
-
-/* Instruction TLB miss */
- START_EXCEPTION(instruction_tlb_miss)
- TLB_MISS_PROLOG
-
- /* If we take a recursive fault, the second level handler may need
- * to know whether we are handling a data or instruction fault in
- * order to get to the right store fault handler. We provide that
- * info by writing a crazy value in ESR in our exception frame
- */
- li r14,-1 /* store to exception frame is done later */
-
- /* Now we handle the fault proper. We only save DEAR in the non
- * linear mapping case since we know the linear mapping case will
- * not re-enter. We could indeed optimize and also not save SRR0/1
- * in the linear mapping case but I'll leave that for later
- *
- * Faulting address is SRR0 which is already in r16
- */
- srdi r15,r16,44 /* get region */
- xoris r15,r15,0xc
- cmpldi cr0,r15,0 /* linear mapping ? */
- beq tlb_load_linear /* yes -> go to linear map load */
- cmpldi cr1,r15,1 /* vmalloc mapping ? */
-
- /* We do the user/kernel test for the PID here along with the RW test
- */
- li r11,_PAGE_PRESENT|_PAGE_BAP_UX /* Base perm */
- oris r11,r11,_PAGE_ACCESSED@h
-
- srdi. r15,r16,60 /* Check for user region */
- std r14,EX_TLB_ESR(r12) /* write crazy -1 to frame */
- beq normal_tlb_miss_user
-
- li r11,_PAGE_PRESENT|_PAGE_BAP_SX /* Base perm */
- oris r11,r11,_PAGE_ACCESSED@h
- /* XXX replace the RMW cycles with immediate loads + writes */
- mfspr r10,SPRN_MAS1
- rlwinm r10,r10,0,16,1 /* Clear TID */
- mtspr SPRN_MAS1,r10
- beq+ cr1,normal_tlb_miss
-
- /* We got a crappy address, just fault */
- TLB_MISS_EPILOG_ERROR
- b exc_instruction_storage_book3e
-
-/*
- * This is the guts of the first-level TLB miss handler for direct
- * misses. We are entered with:
- *
- * r16 = faulting address
- * r15 = region ID
- * r14 = crap (free to use)
- * r13 = PACA
- * r12 = TLB exception frame in PACA
- * r11 = PTE permission mask
- * r10 = crap (free to use)
- */
-normal_tlb_miss_user:
-#ifdef CONFIG_PPC_KUAP
- mfspr r14,SPRN_MAS1
- rlwinm. r14,r14,0,0x3fff0000
- beq- normal_tlb_miss_access_fault /* KUAP fault */
-#endif
-normal_tlb_miss:
- /* So we first construct the page table address. We do that by
- * shifting the bottom of the address (not the region ID) by
- * PAGE_SHIFT-3, clearing the bottom 3 bits (get a PTE ptr) and
- * or'ing the fourth high bit.
- *
- * NOTE: For 64K pages, we do things slightly differently in
- * order to handle the weird page table format used by linux
- */
- srdi r15,r16,44
- oris r10,r15,0x1
- rldicl r14,r16,64-(PAGE_SHIFT-3),PAGE_SHIFT-3+4
- sldi r15,r10,44
- clrrdi r14,r14,19
- or r10,r15,r14
-
- ld r14,0(r10)
-
-finish_normal_tlb_miss:
- /* Check if required permissions are met */
- andc. r15,r11,r14
- bne- normal_tlb_miss_access_fault
-
- /* Now we build the MAS:
- *
- * MAS 0 : Fully setup with defaults in MAS4 and TLBnCFG
- * MAS 1 : Almost fully setup
- * - PID already updated by caller if necessary
- * - TSIZE need change if !base page size, not
- * yet implemented for now
- * MAS 2 : Defaults not useful, need to be redone
- * MAS 3+7 : Needs to be done
- *
- * TODO: mix up code below for better scheduling
- */
- clrrdi r10,r16,12 /* Clear low crap in EA */
- rlwimi r10,r14,32-19,27,31 /* Insert WIMGE */
- mtspr SPRN_MAS2,r10
-
- /* Check page size, if not standard, update MAS1 */
- rldicl r10,r14,64-8,64-8
- cmpldi cr0,r10,BOOK3E_PAGESZ_4K
- beq- 1f
- mfspr r11,SPRN_MAS1
- rlwimi r11,r14,31,21,24
- rlwinm r11,r11,0,21,19
- mtspr SPRN_MAS1,r11
-1:
- /* Move RPN in position */
- rldicr r11,r14,64-(PTE_RPN_SHIFT-PAGE_SHIFT),63-PAGE_SHIFT
- clrldi r15,r11,12 /* Clear crap at the top */
- rlwimi r15,r14,32-8,22,25 /* Move in U bits */
- rlwimi r15,r14,32-2,26,31 /* Move in BAP bits */
-
- /* Mask out SW and UW if !DIRTY (XXX optimize this !) */
- andi. r11,r14,_PAGE_DIRTY
- bne 1f
- li r11,MAS3_SW|MAS3_UW
- andc r15,r15,r11
-1:
- srdi r16,r15,32
- mtspr SPRN_MAS3,r15
- mtspr SPRN_MAS7,r16
-
- tlbwe
-
-normal_tlb_miss_done:
- /* We don't bother with restoring DEAR or ESR since we know we are
- * level 0 and just going back to userland. They are only needed
- * if you are going to take an access fault
- */
- TLB_MISS_EPILOG_SUCCESS
- rfi
-
-normal_tlb_miss_access_fault:
- /* We need to check if it was an instruction miss */
- andi. r10,r11,_PAGE_BAP_UX
- bne 1f
- ld r14,EX_TLB_DEAR(r12)
- ld r15,EX_TLB_ESR(r12)
- mtspr SPRN_DEAR,r14
- mtspr SPRN_ESR,r15
- TLB_MISS_EPILOG_ERROR
- b exc_data_storage_book3e
-1: TLB_MISS_EPILOG_ERROR
- b exc_instruction_storage_book3e
-
-
/*
* This is the guts of the second-level TLB miss handler for direct
* misses. We are entered with:
@@ -893,201 +667,6 @@ virt_page_table_tlb_miss_whacko_fault:
TLB_MISS_EPILOG_ERROR
b exc_data_storage_book3e
-
-/**************************************************************
- * *
- * TLB miss handling for Book3E with hw page table support *
- * *
- **************************************************************/
-
-
-/* Data TLB miss */
- START_EXCEPTION(data_tlb_miss_htw)
- TLB_MISS_PROLOG
-
- /* Now we handle the fault proper. We only save DEAR in normal
- * fault case since that's the only interesting values here.
- * We could probably also optimize by not saving SRR0/1 in the
- * linear mapping case but I'll leave that for later
- */
- mfspr r14,SPRN_ESR
- mfspr r16,SPRN_DEAR /* get faulting address */
- srdi r11,r16,44 /* get region */
- xoris r11,r11,0xc
- cmpldi cr0,r11,0 /* linear mapping ? */
- beq tlb_load_linear /* yes -> go to linear map load */
- cmpldi cr1,r11,1 /* vmalloc mapping ? */
-
- /* We do the user/kernel test for the PID here along with the RW test
- */
- srdi. r11,r16,60 /* Check for user region */
- ld r15,PACAPGD(r13) /* Load user pgdir */
- beq htw_tlb_miss
-
- /* XXX replace the RMW cycles with immediate loads + writes */
-1: mfspr r10,SPRN_MAS1
- rlwinm r10,r10,0,16,1 /* Clear TID */
- mtspr SPRN_MAS1,r10
- ld r15,PACA_KERNELPGD(r13) /* Load kernel pgdir */
- beq+ cr1,htw_tlb_miss
-
- /* We got a crappy address, just fault with whatever DEAR and ESR
- * are here
- */
- TLB_MISS_EPILOG_ERROR
- b exc_data_storage_book3e
-
-/* Instruction TLB miss */
- START_EXCEPTION(instruction_tlb_miss_htw)
- TLB_MISS_PROLOG
-
- /* If we take a recursive fault, the second level handler may need
- * to know whether we are handling a data or instruction fault in
- * order to get to the right store fault handler. We provide that
- * info by keeping a crazy value for ESR in r14
- */
- li r14,-1 /* store to exception frame is done later */
-
- /* Now we handle the fault proper. We only save DEAR in the non
- * linear mapping case since we know the linear mapping case will
- * not re-enter. We could indeed optimize and also not save SRR0/1
- * in the linear mapping case but I'll leave that for later
- *
- * Faulting address is SRR0 which is already in r16
- */
- srdi r11,r16,44 /* get region */
- xoris r11,r11,0xc
- cmpldi cr0,r11,0 /* linear mapping ? */
- beq tlb_load_linear /* yes -> go to linear map load */
- cmpldi cr1,r11,1 /* vmalloc mapping ? */
-
- /* We do the user/kernel test for the PID here along with the RW test
- */
- srdi. r11,r16,60 /* Check for user region */
- ld r15,PACAPGD(r13) /* Load user pgdir */
- beq htw_tlb_miss
-
- /* XXX replace the RMW cycles with immediate loads + writes */
-1: mfspr r10,SPRN_MAS1
- rlwinm r10,r10,0,16,1 /* Clear TID */
- mtspr SPRN_MAS1,r10
- ld r15,PACA_KERNELPGD(r13) /* Load kernel pgdir */
- beq+ htw_tlb_miss
-
- /* We got a crappy address, just fault */
- TLB_MISS_EPILOG_ERROR
- b exc_instruction_storage_book3e
-
-
-/*
- * This is the guts of the second-level TLB miss handler for direct
- * misses. We are entered with:
- *
- * r16 = virtual page table faulting address
- * r15 = PGD pointer
- * r14 = ESR
- * r13 = PACA
- * r12 = TLB exception frame in PACA
- * r11 = crap (free to use)
- * r10 = crap (free to use)
- *
- * It can be re-entered by the linear mapping miss handler. However, to
- * avoid too much complication, it will save/restore things for us
- */
-htw_tlb_miss:
-#ifdef CONFIG_PPC_KUAP
- mfspr r10,SPRN_MAS1
- rlwinm. r10,r10,0,0x3fff0000
- beq- htw_tlb_miss_fault /* KUAP fault */
-#endif
- /* Search if we already have a TLB entry for that virtual address, and
- * if we do, bail out.
- *
- * MAS1:IND should be already set based on MAS4
- */
- PPC_TLBSRX_DOT(0,R16)
- beq htw_tlb_miss_done
-
- /* Now, we need to walk the page tables. First check if we are in
- * range.
- */
- rldicl. r10,r16,64-PGTABLE_EADDR_SIZE,PGTABLE_EADDR_SIZE+4
- bne- htw_tlb_miss_fault
-
- /* Get the PGD pointer */
- cmpldi cr0,r15,0
- beq- htw_tlb_miss_fault
-
- /* Get to PGD entry */
- rldicl r11,r16,64-(PGDIR_SHIFT-3),64-PGD_INDEX_SIZE-3
- clrrdi r10,r11,3
- ldx r15,r10,r15
- cmpdi cr0,r15,0
- bge htw_tlb_miss_fault
-
- /* Get to PUD entry */
- rldicl r11,r16,64-(PUD_SHIFT-3),64-PUD_INDEX_SIZE-3
- clrrdi r10,r11,3
- ldx r15,r10,r15
- cmpdi cr0,r15,0
- bge htw_tlb_miss_fault
-
- /* Get to PMD entry */
- rldicl r11,r16,64-(PMD_SHIFT-3),64-PMD_INDEX_SIZE-3
- clrrdi r10,r11,3
- ldx r15,r10,r15
- cmpdi cr0,r15,0
- bge htw_tlb_miss_fault
-
- /* Ok, we're all right, we can now create an indirect entry for
- * a 1M or 256M page.
- *
- * The last trick is now that because we use "half" pages for
- * the HTW (1M IND is 2K and 256M IND is 32K) we need to account
- * for an added LSB bit to the RPN. For 64K pages, there is no
- * problem as we already use 32K arrays (half PTE pages), but for
- * 4K page we need to extract a bit from the virtual address and
- * insert it into the "PA52" bit of the RPN.
- */
- rlwimi r15,r16,32-9,20,20
- /* Now we build the MAS:
- *
- * MAS 0 : Fully setup with defaults in MAS4 and TLBnCFG
- * MAS 1 : Almost fully setup
- * - PID already updated by caller if necessary
- * - TSIZE for now is base ind page size always
- * MAS 2 : Use defaults
- * MAS 3+7 : Needs to be done
- */
- ori r10,r15,(BOOK3E_PAGESZ_4K << MAS3_SPSIZE_SHIFT)
-
- srdi r16,r10,32
- mtspr SPRN_MAS3,r10
- mtspr SPRN_MAS7,r16
-
- tlbwe
-
-htw_tlb_miss_done:
- /* We don't bother with restoring DEAR or ESR since we know we are
- * level 0 and just going back to userland. They are only needed
- * if you are going to take an access fault
- */
- TLB_MISS_EPILOG_SUCCESS
- rfi
-
-htw_tlb_miss_fault:
- /* We need to check if it was an instruction miss. We know this
- * though because r14 would contain -1
- */
- cmpdi cr0,r14,-1
- beq 1f
- mtspr SPRN_DEAR,r16
- mtspr SPRN_ESR,r14
- TLB_MISS_EPILOG_ERROR
- b exc_data_storage_book3e
-1: TLB_MISS_EPILOG_ERROR
- b exc_instruction_storage_book3e
-
/*
* This is the guts of "any" level TLB miss handler for kernel linear
* mapping misses. We are entered with:
--
2.44.0
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