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Kernel: Replace some hard-coded memory addresses with macros

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This commit is contained in:
Gunnar Beutner 2021-07-01 17:11:03 +02:00 committed by Andreas Kling
parent e8a25f3795
commit 5ca95b3957
Notes: sideshowbarker 2024-07-18 10:32:05 +09:00 
Author: https://github.com/gunnarbeutner
Commit: https://github.com/SerenityOS/serenity/commit/5ca95b3957a
Pull-request: https://github.com/SerenityOS/serenity/pull/8414
2 changed files with 49 additions and 45 deletions
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44
Kernel/Arch/x86/i386/Boot/boot.S
View File

@ -1,3 +1,5 @@
.set KERNEL_VIRTUAL_BASE, 0xc0000000
.section .stack, "aw", @nobits
stack_bottom:
.skip 32768
@ -93,55 +95,55 @@ start:
addl $16, %esi
movl (%esi), %esi
movl $1024, %ecx
movl $(kernel_cmdline - 0xc0000000), %edi
movl $(kernel_cmdline - KERNEL_VIRTUAL_BASE), %edi
rep movsl
/* clear pdpt */
movl $(boot_pdpt - 0xc0000000), %edi
movl $(boot_pdpt - KERNEL_VIRTUAL_BASE), %edi
movl $1024, %ecx
xorl %eax, %eax
rep stosl
/* set up pdpt[0] and pdpt[3] */
movl $(boot_pdpt - 0xc0000000), %edi
movl $((boot_pd0 - 0xc0000000) + 1), 0(%edi)
movl $((boot_pd3 - 0xc0000000) + 1), 24(%edi)
movl $(boot_pdpt - KERNEL_VIRTUAL_BASE), %edi
movl $((boot_pd0 - KERNEL_VIRTUAL_BASE) + 1), 0(%edi)
movl $((boot_pd3 - KERNEL_VIRTUAL_BASE) + 1), 24(%edi)
/* clear pd0 */
movl $(boot_pd0 - 0xc0000000), %edi
movl $(boot_pd0 - KERNEL_VIRTUAL_BASE), %edi
movl $1024, %ecx
xorl %eax, %eax
rep stosl
/* clear pd3 */
movl $(boot_pd3 - 0xc0000000), %edi
movl $(boot_pd3 - KERNEL_VIRTUAL_BASE), %edi
movl $1024, %ecx
xorl %eax, %eax
rep stosl
/* clear pd0's pt's */
movl $(boot_pd0_pt0 - 0xc0000000), %edi
movl $(boot_pd0_pt0 - KERNEL_VIRTUAL_BASE), %edi
movl $(1024 * 4), %ecx
xorl %eax, %eax
rep stosl
/* clear pd3's pt's */
movl $(boot_pd3_pts - 0xc0000000), %edi
movl $(boot_pd3_pts - KERNEL_VIRTUAL_BASE), %edi
movl $(1024 * 17), %ecx
xorl %eax, %eax
rep stosl
/* add boot_pd0_pt0 to boot_pd0 */
movl $(boot_pd0 - 0xc0000000), %edi
movl $(boot_pd0_pt0 - 0xc0000000), %eax
movl $(boot_pd0 - KERNEL_VIRTUAL_BASE), %edi
movl $(boot_pd0_pt0 - KERNEL_VIRTUAL_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 - 0xc0000000), %edi
movl $(boot_pd3_pts - 0xc0000000), %eax
movl $(boot_pd3 - KERNEL_VIRTUAL_BASE), %edi
movl $(boot_pd3_pts - KERNEL_VIRTUAL_BASE), %eax
1:
movl %eax, 0(%edi)
@ -153,7 +155,7 @@ start:
/* identity map the 0 to 2MB range */
movl $512, %ecx
movl $(boot_pd0_pt0 - 0xc0000000), %edi
movl $(boot_pd0_pt0 - KERNEL_VIRTUAL_BASE), %edi
xorl %eax, %eax
1:
@ -166,7 +168,7 @@ start:
/* pseudo identity map the 3072-3102MB range */
movl $(512 * 16), %ecx
movl $(boot_pd3_pts - 0xc0000000), %edi
movl $(boot_pd3_pts - KERNEL_VIRTUAL_BASE), %edi
xorl %eax, %eax
1:
@ -178,13 +180,13 @@ start:
loop 1b
/* create an empty page table for the top 2MB at the 4GB mark */
movl $(boot_pd3 - 0xc0000000), %edi
movl $(boot_pd3_pt1023 - 0xc0000000), 4088(%edi)
movl $(boot_pd3 - KERNEL_VIRTUAL_BASE), %edi
movl $(boot_pd3_pt1023 - KERNEL_VIRTUAL_BASE), 4088(%edi)
orl $0x3, 4088(%edi)
movl $0, 4092(%edi)
/* point CR3 to PDPT */
movl $(boot_pdpt - 0xc0000000), %eax
movl $(boot_pdpt - KERNEL_VIRTUAL_BASE), %eax
movl %eax, %cr3
/* enable PAE + PSE */
@ -210,7 +212,7 @@ start:
/* unmap the 0-1MB range, which isn't used after jmp-ing up here */
movl $256, %ecx
movl $(boot_pd0_pt0 - 0xc0000000), %edi
movl $(boot_pd0_pt0 - KERNEL_VIRTUAL_BASE), %edi
xorl %eax, %eax
1:
@ -219,7 +221,7 @@ start:
loop 1b
/* jump into C++ land */
addl $0xc0000000, %ebx
addl $KERNEL_VIRTUAL_BASE, %ebx
movl %ebx, multiboot_info_ptr
call init
@ -339,7 +341,7 @@ 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 $0xc0000000, %eax
addl $KERNEL_VIRTUAL_BASE, %eax
movl 0(%eax, %esi, 4), %eax
push %eax

50
Kernel/Arch/x86/x86_64/Boot/boot.S
View File

@ -1,4 +1,6 @@
.code32
.set KERNEL_VIRTUAL_BASE, 0xc0000000
.section .stack, "aw", @nobits
stack_bottom:
.skip 32768
@ -128,67 +130,67 @@ continue:
addl $16, %esi
movl (%esi), %esi
movl $1024, %ecx
movl $(kernel_cmdline - 0xc0000000), %edi
movl $(kernel_cmdline - KERNEL_VIRTUAL_BASE), %edi
rep movsl
/* clear pml4t */
movl $(boot_pml4t - 0xc0000000), %edi
movl $(boot_pml4t - KERNEL_VIRTUAL_BASE), %edi
movl $1024, %ecx
xorl %eax, %eax
rep stosl
/* set up pml4t[0] */
movl $(boot_pml4t - 0xc0000000), %edi
movl $(boot_pdpt - 0xc0000000), 0(%edi)
movl $(boot_pml4t - KERNEL_VIRTUAL_BASE), %edi
movl $(boot_pdpt - KERNEL_VIRTUAL_BASE), 0(%edi)
/* R/W + Present */
orl $0x3, 0(%edi)
/* clear pdpt */
movl $(boot_pdpt - 0xc0000000), %edi
movl $(boot_pdpt - KERNEL_VIRTUAL_BASE), %edi
movl $1024, %ecx
xorl %eax, %eax
rep stosl
/* set up pdpt[0] and pdpt[3] */
movl $(boot_pdpt - 0xc0000000), %edi
movl $((boot_pd0 - 0xc0000000) + 3), 0(%edi)
movl $((boot_pd3 - 0xc0000000) + 3), 24(%edi)
movl $(boot_pdpt - KERNEL_VIRTUAL_BASE), %edi
movl $((boot_pd0 - KERNEL_VIRTUAL_BASE) + 3), 0(%edi)
movl $((boot_pd3 - KERNEL_VIRTUAL_BASE) + 3), 24(%edi)
/* clear pd0 */
movl $(boot_pd0 - 0xc0000000), %edi
movl $(boot_pd0 - KERNEL_VIRTUAL_BASE), %edi
movl $1024, %ecx
xorl %eax, %eax
rep stosl
/* clear pd3 */
movl $(boot_pd3 - 0xc0000000), %edi
movl $(boot_pd3 - KERNEL_VIRTUAL_BASE), %edi
movl $1024, %ecx
xorl %eax, %eax
rep stosl
/* clear pd0's pt's */
movl $(boot_pd0_pt0 - 0xc0000000), %edi
movl $(boot_pd0_pt0 - KERNEL_VIRTUAL_BASE), %edi
movl $(1024 * 4), %ecx
xorl %eax, %eax
rep stosl
/* clear pd3's pt's */
movl $(boot_pd3_pts - 0xc0000000), %edi
movl $(boot_pd3_pts - KERNEL_VIRTUAL_BASE), %edi
movl $(1024 * 17), %ecx
xorl %eax, %eax
rep stosl
/* add boot_pd0_pt0 to boot_pd0 */
movl $(boot_pd0 - 0xc0000000), %edi
movl $(boot_pd0_pt0 - 0xc0000000), %eax
movl $(boot_pd0 - KERNEL_VIRTUAL_BASE), %edi
movl $(boot_pd0_pt0 - KERNEL_VIRTUAL_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 - 0xc0000000), %edi
movl $(boot_pd3_pts - 0xc0000000), %eax
movl $(boot_pd3 - KERNEL_VIRTUAL_BASE), %edi
movl $(boot_pd3_pts - KERNEL_VIRTUAL_BASE), %eax
1:
movl %eax, 0(%edi)
@ -200,7 +202,7 @@ continue:
/* identity map the 0 to 2MB range */
movl $512, %ecx
movl $(boot_pd0_pt0 - 0xc0000000), %edi
movl $(boot_pd0_pt0 - KERNEL_VIRTUAL_BASE), %edi
xorl %eax, %eax
1:
@ -213,7 +215,7 @@ continue:
/* pseudo identity map the 3072-3102MB range */
movl $(512 * 16), %ecx
movl $(boot_pd3_pts - 0xc0000000), %edi
movl $(boot_pd3_pts - KERNEL_VIRTUAL_BASE), %edi
xorl %eax, %eax
1:
@ -225,13 +227,13 @@ continue:
loop 1b
/* create an empty page table for the top 2MB at the 4GB mark */
movl $(boot_pd3 - 0xc0000000), %edi
movl $(boot_pd3_pt1023 - 0xc0000000), 4088(%edi)
movl $(boot_pd3 - KERNEL_VIRTUAL_BASE), %edi
movl $(boot_pd3_pt1023 - KERNEL_VIRTUAL_BASE), 4088(%edi)
orl $0x3, 4088(%edi)
movl $0, 4092(%edi)
/* point CR3 to PML4T */
movl $(boot_pml4t - 0xc0000000), %eax
movl $(boot_pml4t - KERNEL_VIRTUAL_BASE), %eax
movl %eax, %cr3
/* enable PAE + PSE */
@ -265,7 +267,7 @@ continue:
/* unmap the 0-1MB range, which isn't used after jmp-ing up here */
movl $256, %ecx
movl $(boot_pd0_pt0 - 0xc0000000), %edi
movl $(boot_pd0_pt0 - KERNEL_VIRTUAL_BASE), %edi
xorl %eax, %eax
1:
@ -274,7 +276,7 @@ continue:
loop 1b
/* jump into C++ land */
addl $0xc0000000, %ebx
addl $KERNEL_VIRTUAL_BASE, %ebx
movl %ebx, multiboot_info_ptr
lgdt gdt64ptr
@ -421,7 +423,7 @@ 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 $0xc0000000, %r8
movq $KERNEL_VIRTUAL_BASE, %r8
addq %r8, %rax
movq 0(%rax, %rsi, 4), %rax
push %rax