diff options
| author | Stephen Rothwell <sfr@canb.auug.org.au> | 2014-08-08 16:22:15 +1000 |
|---|---|---|
| committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2014-08-08 16:22:15 +1000 |
| commit | c39eb7727ca46d1819b66ccb4518376c9f38f568 (patch) | |
| tree | 7dc3b374d1433c72514634a3969515e2c87f7e96 /arch/x86/purgatory/setup-x86_64.S | |
| parent | 9028bb948d3c3a5bfd5c4c66854a34f9a0d3c59d (diff) | |
| parent | fe6140d1e45157761c950abdbab3e9c1777b1e44 (diff) | |
Merge branch 'akpm/master'
Diffstat (limited to 'arch/x86/purgatory/setup-x86_64.S')
| -rw-r--r-- | arch/x86/purgatory/setup-x86_64.S | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/arch/x86/purgatory/setup-x86_64.S b/arch/x86/purgatory/setup-x86_64.S new file mode 100644 index 000000000000..fe3c91ba1bd0 --- /dev/null +++ b/arch/x86/purgatory/setup-x86_64.S @@ -0,0 +1,58 @@ +/* + * purgatory: setup code + * + * Copyright (C) 2003,2004 Eric Biederman (ebiederm@xmission.com) + * Copyright (C) 2014 Red Hat Inc. + * + * This code has been taken from kexec-tools. + * + * This source code is licensed under the GNU General Public License, + * Version 2. See the file COPYING for more details. + */ + + .text + .globl purgatory_start + .balign 16 +purgatory_start: + .code64 + + /* Load a gdt so I know what the segment registers are */ + lgdt gdt(%rip) + + /* load the data segments */ + movl $0x18, %eax /* data segment */ + movl %eax, %ds + movl %eax, %es + movl %eax, %ss + movl %eax, %fs + movl %eax, %gs + + /* Setup a stack */ + leaq lstack_end(%rip), %rsp + + /* Call the C code */ + call purgatory + jmp entry64 + + .section ".rodata" + .balign 16 +gdt: /* 0x00 unusable segment + * 0x08 unused + * so use them as the gdt ptr + */ + .word gdt_end - gdt - 1 + .quad gdt + .word 0, 0, 0 + + /* 0x10 4GB flat code segment */ + .word 0xFFFF, 0x0000, 0x9A00, 0x00AF + + /* 0x18 4GB flat data segment */ + .word 0xFFFF, 0x0000, 0x9200, 0x00CF +gdt_end: + + .bss + .balign 4096 +lstack: + .skip 4096 +lstack_end: |