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x86/boot/compressed: Move startup32_load_idt() out of head_64.S
Now that startup32_load_idt() has been refactored into an ordinary callable function, move it into mem-encrypt.S where it belongs. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lore.kernel.org/r/20221122161017.2426828-13-ardb@kernel.org
This commit is contained in:
Ard Biesheuvel
Borislav Petkov
parent
c6355995ba
commit
9ea813be3d
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@ -707,78 +707,6 @@ SYM_DATA_START(boot_idt)
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.endr
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SYM_DATA_END_LABEL(boot_idt, SYM_L_GLOBAL, boot_idt_end)
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#ifdef CONFIG_AMD_MEM_ENCRYPT
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SYM_DATA_START(boot32_idt_desc)
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.word boot32_idt_end - boot32_idt - 1
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.long 0
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SYM_DATA_END(boot32_idt_desc)
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.balign 8
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SYM_DATA_START(boot32_idt)
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.rept 32
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.quad 0
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.endr
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SYM_DATA_END_LABEL(boot32_idt, SYM_L_GLOBAL, boot32_idt_end)
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.text
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.code32
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/*
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* Write an IDT entry into boot32_idt
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*
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* Parameters:
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*
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* %eax: Handler address
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* %edx: Vector number
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* %ecx: IDT address
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*/
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SYM_FUNC_START_LOCAL(startup32_set_idt_entry)
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/* IDT entry address to %ecx */
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leal (%ecx, %edx, 8), %ecx
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/* Build IDT entry, lower 4 bytes */
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movl %eax, %edx
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andl $0x0000ffff, %edx # Target code segment offset [15:0]
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orl $(__KERNEL32_CS << 16), %edx # Target code segment selector
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/* Store lower 4 bytes to IDT */
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movl %edx, (%ecx)
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/* Build IDT entry, upper 4 bytes */
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movl %eax, %edx
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andl $0xffff0000, %edx # Target code segment offset [31:16]
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orl $0x00008e00, %edx # Present, Type 32-bit Interrupt Gate
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/* Store upper 4 bytes to IDT */
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movl %edx, 4(%ecx)
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RET
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SYM_FUNC_END(startup32_set_idt_entry)
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SYM_FUNC_START(startup32_load_idt)
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push %ebp
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push %ebx
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call 1f
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1: pop %ebp
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leal (boot32_idt - 1b)(%ebp), %ebx
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/* #VC handler */
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leal (startup32_vc_handler - 1b)(%ebp), %eax
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movl $X86_TRAP_VC, %edx
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movl %ebx, %ecx
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call startup32_set_idt_entry
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/* Load IDT */
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leal (boot32_idt_desc - 1b)(%ebp), %ecx
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movl %ebx, 2(%ecx)
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lidt (%ecx)
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pop %ebx
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pop %ebp
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RET
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SYM_FUNC_END(startup32_load_idt)
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#endif
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/*
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* Check for the correct C-bit position when the startup_32 boot-path is used.
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*
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@ -12,6 +12,8 @@
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#include <asm/processor-flags.h>
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#include <asm/msr.h>
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#include <asm/asm-offsets.h>
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#include <asm/segment.h>
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#include <asm/trapnr.h>
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.text
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.code32
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@ -98,7 +100,7 @@ SYM_CODE_START_LOCAL(sev_es_req_cpuid)
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jmp 1b
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SYM_CODE_END(sev_es_req_cpuid)
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SYM_CODE_START(startup32_vc_handler)
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SYM_CODE_START_LOCAL(startup32_vc_handler)
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pushl %eax
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pushl %ebx
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pushl %ecx
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@ -184,6 +186,63 @@ SYM_CODE_START(startup32_vc_handler)
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jmp .Lfail
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SYM_CODE_END(startup32_vc_handler)
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/*
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* Write an IDT entry into boot32_idt
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*
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* Parameters:
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*
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* %eax: Handler address
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* %edx: Vector number
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* %ecx: IDT address
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*/
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SYM_FUNC_START_LOCAL(startup32_set_idt_entry)
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/* IDT entry address to %ecx */
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leal (%ecx, %edx, 8), %ecx
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/* Build IDT entry, lower 4 bytes */
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movl %eax, %edx
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andl $0x0000ffff, %edx # Target code segment offset [15:0]
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orl $(__KERNEL32_CS << 16), %edx # Target code segment selector
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/* Store lower 4 bytes to IDT */
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movl %edx, (%ecx)
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/* Build IDT entry, upper 4 bytes */
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movl %eax, %edx
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andl $0xffff0000, %edx # Target code segment offset [31:16]
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orl $0x00008e00, %edx # Present, Type 32-bit Interrupt Gate
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/* Store upper 4 bytes to IDT */
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movl %edx, 4(%ecx)
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RET
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SYM_FUNC_END(startup32_set_idt_entry)
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SYM_FUNC_START(startup32_load_idt)
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push %ebp
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push %ebx
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call 1f
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1: pop %ebp
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leal (boot32_idt - 1b)(%ebp), %ebx
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/* #VC handler */
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leal (startup32_vc_handler - 1b)(%ebp), %eax
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movl $X86_TRAP_VC, %edx
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movl %ebx, %ecx
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call startup32_set_idt_entry
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/* Load IDT */
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leal (boot32_idt_desc - 1b)(%ebp), %ecx
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movl %ebx, 2(%ecx)
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lidt (%ecx)
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pop %ebx
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pop %ebp
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RET
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SYM_FUNC_END(startup32_load_idt)
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.code64
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#include "../../kernel/sev_verify_cbit.S"
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@ -195,4 +254,15 @@ SYM_CODE_END(startup32_vc_handler)
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SYM_DATA(sme_me_mask, .quad 0)
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SYM_DATA(sev_status, .quad 0)
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SYM_DATA(sev_check_data, .quad 0)
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SYM_DATA_START_LOCAL(boot32_idt)
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.rept 32
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.quad 0
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.endr
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SYM_DATA_END(boot32_idt)
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SYM_DATA_START_LOCAL(boot32_idt_desc)
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.word . - boot32_idt - 1
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.long 0
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SYM_DATA_END(boot32_idt_desc)
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#endif
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