97 lines
2.6 KiB
Diff
97 lines
2.6 KiB
Diff
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From ec8ec8362c46fd86571204d0fcce11c03477e5c5 Mon Sep 17 00:00:00 2001
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From: Matt Fleming <matt@console-pimps.org>
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Date: Wed, 9 Apr 2014 10:33:49 +0200
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Subject: [PATCH 7/7] Fix the use of code32_start in the EFI boot stub
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---
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arch/x86/boot/compressed/eboot.c | 5 +++--
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arch/x86/boot/compressed/head_32.S | 14 ++++++++------
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arch/x86/boot/compressed/head_64.S | 9 +++------
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3 files changed, 14 insertions(+), 14 deletions(-)
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diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c
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index a7677ba..78cbb2d 100644
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--- a/arch/x86/boot/compressed/eboot.c
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+++ b/arch/x86/boot/compressed/eboot.c
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@@ -425,6 +425,9 @@ void setup_graphics(struct boot_params *boot_params)
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* Because the x86 boot code expects to be passed a boot_params we
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* need to create one ourselves (usually the bootloader would create
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* one for us).
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+ *
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+ * The caller is responsible for filling out ->code32_start in the
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+ * returned boot_params.
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*/
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struct boot_params *make_boot_params(void *handle, efi_system_table_t *_table)
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{
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@@ -483,8 +486,6 @@ struct boot_params *make_boot_params(void *handle, efi_system_table_t *_table)
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hdr->vid_mode = 0xffff;
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hdr->boot_flag = 0xAA55;
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- hdr->code32_start = (__u64)(unsigned long)image->image_base;
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-
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hdr->type_of_loader = 0x21;
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/* Convert unicode cmdline to ascii */
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diff --git a/arch/x86/boot/compressed/head_32.S b/arch/x86/boot/compressed/head_32.S
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index 9116aac..f45ab7a 100644
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--- a/arch/x86/boot/compressed/head_32.S
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+++ b/arch/x86/boot/compressed/head_32.S
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@@ -50,6 +50,13 @@ ENTRY(efi_pe_entry)
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pushl %eax
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pushl %esi
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pushl %ecx
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+
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+ call reloc
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+reloc:
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+ popl %ecx
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+ subl reloc, %ecx
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+ movl %ecx, BP_code32_start(%eax)
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+
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sub $0x4, %esp
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ENTRY(efi_stub_entry)
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@@ -63,12 +70,7 @@ ENTRY(efi_stub_entry)
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hlt
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jmp 1b
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2:
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- call 3f
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-3:
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- popl %eax
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- subl $3b, %eax
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- subl BP_pref_address(%esi), %eax
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- add BP_code32_start(%esi), %eax
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+ movl BP_code32_start(%esi), %eax
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leal preferred_addr(%eax), %eax
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jmp *%eax
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diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S
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index c5c1ae0..b10fa66 100644
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--- a/arch/x86/boot/compressed/head_64.S
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+++ b/arch/x86/boot/compressed/head_64.S
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@@ -217,6 +217,8 @@ ENTRY(efi_pe_entry)
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cmpq $0,%rax
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je 1f
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mov %rax, %rdx
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+ leaq startup_32(%rip), %rax
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+ movl %eax, BP_code32_start(%rdx)
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popq %rsi
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popq %rdi
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@@ -230,12 +232,7 @@ ENTRY(efi_stub_entry)
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hlt
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jmp 1b
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2:
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- call 3f
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-3:
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- popq %rax
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- subq $3b, %rax
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- subq BP_pref_address(%rsi), %rax
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- add BP_code32_start(%esi), %eax
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+ movl BP_code32_start(%esi), %eax
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leaq preferred_addr(%rax), %rax
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jmp *%rax
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--
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1.9.1
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