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>
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@ -168,6 +168,12 @@ page_pde_offset = (__PAGE_OFFSET >> 20);
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.section .init.text,"ax",@progbits
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#endif
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/* Do an early initialization of the fixmap area */
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movl $(swapper_pg_dir - __PAGE_OFFSET), %edx
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movl $(swapper_pg_pmd - __PAGE_OFFSET), %eax
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addl $0x007, %eax /* 0x007 = PRESENT+RW+USER */
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movl %eax, 4092(%edx)
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#ifdef CONFIG_SMP
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ENTRY(startup_32_smp)
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cld
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@ -507,6 +513,8 @@ ENTRY(_stext)
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.section ".bss.page_aligned","w"
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ENTRY(swapper_pg_dir)
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.fill 1024,4,0
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ENTRY(swapper_pg_pmd)
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.fill 1024,4,0
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ENTRY(empty_zero_page)
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.fill 4096,1,0
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@ -73,7 +73,11 @@ startup_64:
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addq %rbp, init_level4_pgt + (511*8)(%rip)
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addq %rbp, level3_ident_pgt + 0(%rip)
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addq %rbp, level3_kernel_pgt + (510*8)(%rip)
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addq %rbp, level3_kernel_pgt + (511*8)(%rip)
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addq %rbp, level2_fixmap_pgt + (506*8)(%rip)
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/* Add an Identity mapping if I am above 1G */
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leaq _text(%rip), %rdi
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@ -314,7 +318,16 @@ NEXT_PAGE(level3_kernel_pgt)
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.fill 510,8,0
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/* (2^48-(2*1024*1024*1024)-((2^39)*511))/(2^30) = 510 */
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.quad level2_kernel_pgt - __START_KERNEL_map + _KERNPG_TABLE
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.fill 1,8,0
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.quad level2_fixmap_pgt - __START_KERNEL_map + _PAGE_TABLE
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NEXT_PAGE(level2_fixmap_pgt)
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.fill 506,8,0
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.quad level1_fixmap_pgt - __START_KERNEL_map + _PAGE_TABLE
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/* 8MB reserved for vsyscalls + a 2MB hole = 4 + 1 entries */
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.fill 5,8,0
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NEXT_PAGE(level1_fixmap_pgt)
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.fill 512,8,0
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NEXT_PAGE(level2_ident_pgt)
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/* Since I easily can, map the first 1G.
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