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Message-Id: <1200375906.3505.30.camel@caritas-dev.intel.com>
Date: Tue, 15 Jan 2008 13:45:06 +0800
From: "Huang, Ying" <ying.huang@...el.com>
To: akpm@...ux-foundation.org, "H. Peter Anvin" <hpa@...or.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Andi Kleen <ak@...e.de>
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH -mm 1/3] i386 boot: replace boot_ioremap with enhanced
bt_ioremap - enhance bt_ioremap
This patch makes bt_ioremap can be used before paging_init via
providing an early implementation of set_fixmap that can be used
before paging_init. This makes boot_ioremap can be replaced by
bt_ioremap.
Signed-off-by: Huang Ying <ying.huang@...el.com>
---
arch/x86/kernel/setup_32.c | 1
arch/x86/mm/init_32.c | 2 +
arch/x86/mm/ioremap_32.c | 87 +++++++++++++++++++++++++++++++++++++++++++--
include/asm-x86/io_32.h | 3 +
4 files changed, 91 insertions(+), 2 deletions(-)
--- a/arch/x86/mm/ioremap_32.c
+++ b/arch/x86/mm/ioremap_32.c
@@ -208,6 +208,89 @@ void iounmap(volatile void __iomem *addr
}
EXPORT_SYMBOL(iounmap);
+static __initdata int after_paging_init;
+static __initdata unsigned long bm_pte[1024]
+ __attribute__((aligned(PAGE_SIZE)));
+
+static inline unsigned long * __init bt_ioremap_pgd(unsigned long addr)
+{
+ return (unsigned long *)swapper_pg_dir + ((addr >> 22) & 1023);
+}
+
+static inline unsigned long * __init bt_ioremap_pte(unsigned long addr)
+{
+ return bm_pte + ((addr >> PAGE_SHIFT) & 1023);
+}
+
+void __init bt_ioremap_init(void)
+{
+ unsigned long *pgd;
+
+ pgd = bt_ioremap_pgd(fix_to_virt(FIX_BTMAP_BEGIN));
+ *pgd = __pa(bm_pte) | _PAGE_TABLE;
+ memset(bm_pte, 0, sizeof(bm_pte));
+ BUG_ON(pgd != bt_ioremap_pgd(fix_to_virt(FIX_BTMAP_END)));
+}
+
+void __init bt_ioremap_clear(void)
+{
+ unsigned long *pgd;
+
+ pgd = bt_ioremap_pgd(fix_to_virt(FIX_BTMAP_BEGIN));
+ *pgd = 0;
+ __flush_tlb_all();
+}
+
+void __init bt_ioremap_reset(void)
+{
+ enum fixed_addresses idx;
+ unsigned long *pte, phys, addr;
+
+ after_paging_init = 1;
+ for (idx = FIX_BTMAP_BEGIN; idx <= FIX_BTMAP_END; idx--) {
+ addr = fix_to_virt(idx);
+ pte = bt_ioremap_pte(addr);
+ if (!*pte & _PAGE_PRESENT) {
+ phys = *pte & PAGE_MASK;
+ set_fixmap(idx, phys);
+ }
+ }
+}
+
+static void __init __bt_set_fixmap(enum fixed_addresses idx,
+ unsigned long phys, pgprot_t flags)
+{
+ unsigned long *pte, addr = __fix_to_virt(idx);
+
+ if (idx >= __end_of_fixed_addresses) {
+ BUG();
+ return;
+ }
+ pte = bt_ioremap_pte(addr);
+ if (pgprot_val(flags))
+ *pte = (phys & PAGE_MASK) | pgprot_val(flags);
+ else
+ *pte = 0;
+ __flush_tlb_one(addr);
+}
+
+static inline void __init bt_set_fixmap(enum fixed_addresses idx,
+ unsigned long phys)
+{
+ if (after_paging_init)
+ set_fixmap(idx, phys);
+ else
+ __bt_set_fixmap(idx, phys, PAGE_KERNEL);
+}
+
+static inline void __init bt_clear_fixmap(enum fixed_addresses idx)
+{
+ if (after_paging_init)
+ clear_fixmap(idx);
+ else
+ __bt_set_fixmap(idx, 0, __pgprot(0));
+}
+
void __init *bt_ioremap(unsigned long phys_addr, unsigned long size)
{
unsigned long offset, last_addr;
@@ -244,7 +327,7 @@ void __init *bt_ioremap(unsigned long ph
*/
idx = FIX_BTMAP_BEGIN;
while (nrpages > 0) {
- set_fixmap(idx, phys_addr);
+ bt_set_fixmap(idx, phys_addr);
phys_addr += PAGE_SIZE;
--idx;
--nrpages;
@@ -267,7 +350,7 @@ void __init bt_iounmap(void *addr, unsig
idx = FIX_BTMAP_BEGIN;
while (nrpages > 0) {
- clear_fixmap(idx);
+ bt_clear_fixmap(idx);
--idx;
--nrpages;
}
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -423,9 +423,11 @@ static void __init pagetable_init (void)
* Fixed mappings, only the page table structure has to be
* created - mappings will be set by set_fixmap():
*/
+ bt_ioremap_clear();
vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
page_table_range_init(vaddr, end, pgd_base);
+ bt_ioremap_reset();
permanent_kmaps_init(pgd_base);
--- a/include/asm-x86/io_32.h
+++ b/include/asm-x86/io_32.h
@@ -130,6 +130,9 @@ extern void iounmap(volatile void __iome
* mappings, before the real ioremap() is functional.
* A boot-time mapping is currently limited to at most 16 pages.
*/
+extern void bt_ioremap_init(void);
+extern void bt_ioremap_clear(void);
+extern void bt_ioremap_reset(void);
extern void *bt_ioremap(unsigned long offset, unsigned long size);
extern void bt_iounmap(void *addr, unsigned long size);
extern void __iomem *fix_ioremap(unsigned idx, unsigned long phys);
--- a/arch/x86/kernel/setup_32.c
+++ b/arch/x86/kernel/setup_32.c
@@ -624,6 +624,7 @@ void __init setup_arch(char **cmdline_p)
memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
pre_setup_arch_hook();
early_cpu_init();
+ bt_ioremap_init();
efi_check_bios_type();
#ifdef CONFIG_EFI
--
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