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| author | Eric W. Biderman <ebiderman@xmission.com> | 2007-07-16 10:37:28 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-16 20:05:35 +0400 |
| commit | b1c931e39327ef121797927d4b3198d370e75b9b (patch) | |
| tree | c36c35ce43b1b0f9458cbe0141b4184c078eef12 | |
| parent | d37bf60de0b4ddc1633cf278189d3c9bf28fe3d2 (diff) | |
| download | linux-b1c931e39327ef121797927d4b3198d370e75b9b.tar.xz | |
x86: initial fixmap support
Needed to get fixed virtual address for USB debug and earlycon with mmio.
Signed-off-by: Eric W. Biderman <ebiderman@xmisson.com>
Signed-off-by: Yinghai Lu <yinghai.lu@sun.com>
Cc: Andi Kleen <ak@suse.de>
Cc: Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Gerd Hoffmann <kraxel@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | arch/i386/kernel/head.S | 8 | ||||
| -rw-r--r-- | arch/x86_64/kernel/head.S | 15 |
2 files changed, 22 insertions, 1 deletions
diff --git a/arch/i386/kernel/head.S b/arch/i386/kernel/head.S index f74dfc419b56..82714668d43b 100644 --- a/arch/i386/kernel/head.S +++ b/arch/i386/kernel/head.S @@ -168,6 +168,12 @@ page_pde_offset = (__PAGE_OFFSET >> 20); .section .init.text,"ax",@progbits #endif + /* Do an early initialization of the fixmap area */ + movl $(swapper_pg_dir - __PAGE_OFFSET), %edx + movl $(swapper_pg_pmd - __PAGE_OFFSET), %eax + addl $0x007, %eax /* 0x007 = PRESENT+RW+USER */ + movl %eax, 4092(%edx) + #ifdef CONFIG_SMP ENTRY(startup_32_smp) cld @@ -507,6 +513,8 @@ ENTRY(_stext) .section ".bss.page_aligned","w" ENTRY(swapper_pg_dir) .fill 1024,4,0 +ENTRY(swapper_pg_pmd) + .fill 1024,4,0 ENTRY(empty_zero_page) .fill 4096,1,0 diff --git a/arch/x86_64/kernel/head.S b/arch/x86_64/kernel/head.S index 1fab487dee86..941c84baecc8 100644 --- a/arch/x86_64/kernel/head.S +++ b/arch/x86_64/kernel/head.S @@ -73,7 +73,11 @@ startup_64: addq %rbp, init_level4_pgt + (511*8)(%rip) addq %rbp, level3_ident_pgt + 0(%rip) + addq %rbp, level3_kernel_pgt + (510*8)(%rip) + addq %rbp, level3_kernel_pgt + (511*8)(%rip) + + addq %rbp, level2_fixmap_pgt + (506*8)(%rip) /* Add an Identity mapping if I am above 1G */ leaq _text(%rip), %rdi @@ -314,7 +318,16 @@ NEXT_PAGE(level3_kernel_pgt) .fill 510,8,0 /* (2^48-(2*1024*1024*1024)-((2^39)*511))/(2^30) = 510 */ .quad level2_kernel_pgt - __START_KERNEL_map + _KERNPG_TABLE - .fill 1,8,0 + .quad level2_fixmap_pgt - __START_KERNEL_map + _PAGE_TABLE + +NEXT_PAGE(level2_fixmap_pgt) + .fill 506,8,0 + .quad level1_fixmap_pgt - __START_KERNEL_map + _PAGE_TABLE + /* 8MB reserved for vsyscalls + a 2MB hole = 4 + 1 entries */ + .fill 5,8,0 + +NEXT_PAGE(level1_fixmap_pgt) + .fill 512,8,0 NEXT_PAGE(level2_ident_pgt) /* Since I easily can, map the first 1G. |