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Kernel: Get rid of of some of the duplicate kernel base address macros

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Gunnar Beutner 2021-07-05 01:20:34 +02:00 committed by Andreas Kling
parent 040fe0054b
commit 8c14488106
Notes: sideshowbarker 2024-07-18 10:24:52 +09:00 
Author: https://github.com/gunnarbeutner
Commit: https://github.com/SerenityOS/serenity/commit/8c144881060
Pull-request: https://github.com/SerenityOS/serenity/pull/8445
Reviewed-by: https://github.com/Hendiadyoin1
Reviewed-by: https://github.com/awesomekling ✅
4 changed files with 34 additions and 32 deletions
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54
Kernel/Arch/x86/common/Boot/boot.S
View file

@ -1,8 +1,8 @@
#define _BOOTLOADER
#include <AK/Platform.h>
#include <Kernel/Sections.h>
.code32
.set KERNEL_VIRTUAL_BASE, 0xc0000000
.section .stack, "aw", @nobits
stack_bottom:
@ -142,74 +142,74 @@ continue:
addl $16, %esi
movl (%esi), %esi
movl $1024, %ecx
movl $(kernel_cmdline - KERNEL_VIRTUAL_BASE), %edi
movl $(kernel_cmdline - KERNEL_BASE), %edi
rep movsl
#if ARCH(X86_64)
/* clear pml4t */
movl $(boot_pml4t - KERNEL_VIRTUAL_BASE), %edi
movl $(boot_pml4t - KERNEL_BASE), %edi
movl $1024, %ecx
xorl %eax, %eax
rep stosl
/* set up pml4t[0] */
movl $(boot_pml4t - KERNEL_VIRTUAL_BASE), %edi
movl $(boot_pdpt - KERNEL_VIRTUAL_BASE), 0(%edi)
movl $(boot_pml4t - KERNEL_BASE), %edi
movl $(boot_pdpt - KERNEL_BASE), 0(%edi)
/* R/W + Present */
orl $0x3, 0(%edi)
#endif
/* clear pdpt */
movl $(boot_pdpt - KERNEL_VIRTUAL_BASE), %edi
movl $(boot_pdpt - KERNEL_BASE), %edi
movl $1024, %ecx
xorl %eax, %eax
rep stosl
/* set up pdpt[0] and pdpt[3] */
movl $(boot_pdpt - KERNEL_VIRTUAL_BASE), %edi
movl $(boot_pdpt - KERNEL_BASE), %edi
#if ARCH(X86_64)
movl $((boot_pd0 - KERNEL_VIRTUAL_BASE) + 3), 0(%edi)
movl $((boot_pd3 - KERNEL_VIRTUAL_BASE) + 3), 24(%edi)
movl $((boot_pd0 - KERNEL_BASE) + 3), 0(%edi)
movl $((boot_pd3 - KERNEL_BASE) + 3), 24(%edi)
#else
movl $((boot_pd0 - KERNEL_VIRTUAL_BASE) + 1), 0(%edi)
movl $((boot_pd3 - KERNEL_VIRTUAL_BASE) + 1), 24(%edi)
movl $((boot_pd0 - KERNEL_BASE) + 1), 0(%edi)
movl $((boot_pd3 - KERNEL_BASE) + 1), 24(%edi)
#endif
/* clear pd0 */
movl $(boot_pd0 - KERNEL_VIRTUAL_BASE), %edi
movl $(boot_pd0 - KERNEL_BASE), %edi
movl $1024, %ecx
xorl %eax, %eax
rep stosl
/* clear pd3 */
movl $(boot_pd3 - KERNEL_VIRTUAL_BASE), %edi
movl $(boot_pd3 - KERNEL_BASE), %edi
movl $1024, %ecx
xorl %eax, %eax
rep stosl
/* clear pd0's pt's */
movl $(boot_pd0_pt0 - KERNEL_VIRTUAL_BASE), %edi
movl $(boot_pd0_pt0 - KERNEL_BASE), %edi
movl $(1024 * 4), %ecx
xorl %eax, %eax
rep stosl
/* clear pd3's pt's */
movl $(boot_pd3_pts - KERNEL_VIRTUAL_BASE), %edi
movl $(boot_pd3_pts - KERNEL_BASE), %edi
movl $(1024 * 17), %ecx
xorl %eax, %eax
rep stosl
/* add boot_pd0_pt0 to boot_pd0 */
movl $(boot_pd0 - KERNEL_VIRTUAL_BASE), %edi
movl $(boot_pd0_pt0 - KERNEL_VIRTUAL_BASE), %eax
movl $(boot_pd0 - KERNEL_BASE), %edi
movl $(boot_pd0_pt0 - KERNEL_BASE), %eax
movl %eax, 0(%edi)
/* R/W + Present */
orl $0x3, 0(%edi)
/* add boot_pd3_pts to boot_pd3 */
movl $16, %ecx
movl $(boot_pd3 - KERNEL_VIRTUAL_BASE), %edi
movl $(boot_pd3_pts - KERNEL_VIRTUAL_BASE), %eax
movl $(boot_pd3 - KERNEL_BASE), %edi
movl $(boot_pd3_pts - KERNEL_BASE), %eax
1:
movl %eax, 0(%edi)
@ -221,7 +221,7 @@ continue:
/* identity map the 0 to 2MB range */
movl $512, %ecx
movl $(boot_pd0_pt0 - KERNEL_VIRTUAL_BASE), %edi
movl $(boot_pd0_pt0 - KERNEL_BASE), %edi
xorl %eax, %eax
1:
@ -234,7 +234,7 @@ continue:
/* pseudo identity map the 3072-3102MB range */
movl $(512 * 16), %ecx
movl $(boot_pd3_pts - KERNEL_VIRTUAL_BASE), %edi
movl $(boot_pd3_pts - KERNEL_BASE), %edi
xorl %eax, %eax
1:
@ -246,17 +246,17 @@ continue:
loop 1b
/* create an empty page table for the top 2MB at the 4GB mark */
movl $(boot_pd3 - KERNEL_VIRTUAL_BASE), %edi
movl $(boot_pd3_pt1023 - KERNEL_VIRTUAL_BASE), 4088(%edi)
movl $(boot_pd3 - KERNEL_BASE), %edi
movl $(boot_pd3_pt1023 - KERNEL_BASE), 4088(%edi)
orl $0x3, 4088(%edi)
movl $0, 4092(%edi)
#if ARCH(X86_64)
/* point CR3 to PML4T */
movl $(boot_pml4t - KERNEL_VIRTUAL_BASE), %eax
movl $(boot_pml4t - KERNEL_BASE), %eax
#else
/* point CR3 to PDPT */
movl $(boot_pdpt - KERNEL_VIRTUAL_BASE), %eax
movl $(boot_pdpt - KERNEL_BASE), %eax
#endif
movl %eax, %cr3
@ -293,7 +293,7 @@ continue:
/* unmap the 0-1MB range, which isn't used after jmp-ing up here */
movl $256, %ecx
movl $(boot_pd0_pt0 - KERNEL_VIRTUAL_BASE), %edi
movl $(boot_pd0_pt0 - KERNEL_BASE), %edi
xorl %eax, %eax
1:
@ -302,7 +302,7 @@ continue:
loop 1b
/* jump into C++ land */
addl $KERNEL_VIRTUAL_BASE, %ebx
addl $KERNEL_BASE, %ebx
movl %ebx, multiboot_info_ptr
#if ARCH(X86_64)

5
Kernel/Arch/x86/i386/Boot/ap_setup.S
View file

@ -1,4 +1,5 @@
.set KERNEL_VIRTUAL_BASE, 0xc0000000
#define _BOOTLOADER
#include <Kernel/Sections.h>
.extern init_ap
.type init_ap, @function
@ -109,7 +110,7 @@ apic_ap_start32_2:
/* push the Processor pointer this CPU is going to use */
movl (ap_cpu_init_processor_info_array - apic_ap_start)(%ebp), %eax
addl $KERNEL_VIRTUAL_BASE, %eax
addl $KERNEL_BASE, %eax
movl 0(%eax, %esi, 4), %eax
push %eax

5
Kernel/Arch/x86/x86_64/Boot/ap_setup.S
View file

@ -1,4 +1,5 @@
.set KERNEL_VIRTUAL_BASE, 0xc0000000
#define _BOOTLOADER
#include <Kernel/Sections.h>
.extern init_ap
.type init_ap, @function
@ -124,7 +125,7 @@ apic_ap_start64:
/* push the Processor pointer this CPU is going to use */
movq (ap_cpu_init_processor_info_array - apic_ap_start)(%ebp), %rax
movq $KERNEL_VIRTUAL_BASE, %r8
movq $KERNEL_BASE, %r8
addq %r8, %rax
movq 0(%rax, %rsi, 4), %rax
push %rax

2
Kernel/Sections.h
View file

@ -11,4 +11,4 @@
#define READONLY_AFTER_INIT __attribute__((section(".ro_after_init")))
#define UNMAP_AFTER_INIT NEVER_INLINE __attribute__((section(".unmap_after_init")))
#define KERNEL_BASE 0xC000'0000
#define KERNEL_BASE 0xC0000000