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Kernel: Update the x86_64 boot code to match i386's code

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This commit is contained in:
Gunnar Beutner 2021-06-24 12:58:57 +02:00 • committed by Andreas Kling
parent 1979c7d185
commit 19c0498ccc
1 changed files with 28 additions and 18 deletions
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46
Kernel/Arch/x86/x86_64/Boot/boot.S
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@ -52,17 +52,17 @@ boot_pd0_pt0:
.skip 4096 * 4
.global boot_pd3_pts
boot_pd3_pts:
.skip 4096 * 8
.skip 4096 * 16
.global boot_pd3_pt1023
boot_pd3_pt1023:
.skip 4096
.section .text
.section .boot_text, "ax"
.global start
.type start, @function
.extern init
.extern init
.type init, @function
.extern multiboot_info_ptr
@ -92,7 +92,17 @@ boot_pd3 : 512 pde's
5: boot_pd3_pts[5] (3082-3084MB) (pseudo 512 4KB pages)
6: boot_pd3_pts[6] (3084-3086MB) (pseudo 512 4KB pages)
7: boot_pd3_pts[7] (3086-3088MB) (pseudo 512 4KB pages)
8: boot_pd3_pt1023 (4094-4096MB) (for page table mappings)
8: boot_pd3_pts[8] (3088-3090MB) (pseudo 512 4KB pages)
9: boot_pd3_pts[9] (3090-3076MB) (pseudo 512 4KB pages)
10: boot_pd3_pts[10] (3092-3094MB) (pseudo 512 4KB pages)
11: boot_pd3_pts[11] (3094-3096MB) (pseudo 512 4KB pages)
12: boot_pd3_pts[12] (3096-3098MB) (pseudo 512 4KB pages)
13: boot_pd3_pts[13] (3098-3100MB) (pseudo 512 4KB pages)
14: boot_pd3_pts[14] (3100-3102MB) (pseudo 512 4KB pages)
15: boot_pd3_pts[15] (3102-3104MB) (pseudo 512 4KB pages)
16: boot_pd3_pt1023 (4094-4096MB) (for page table mappings)
the 9 page tables each contain 512 pte's that map individual 4KB pages
@ -146,7 +156,7 @@ start:
/* clear pd3's pt's */
movl $(boot_pd3_pts - 0xc0000000), %edi
movl $(1024 * 9), %ecx
movl $(1024 * 17), %ecx
xorl %eax, %eax
rep stosl
@ -158,7 +168,7 @@ start:
orl $0x3, 0(%edi)
/* add boot_pd3_pts to boot_pd3 */
movl $8, %ecx
movl $16, %ecx
movl $(boot_pd3 - 0xc0000000), %edi
movl $(boot_pd3_pts - 0xc0000000), %eax
@ -183,8 +193,8 @@ start:
addl $4096, %eax
loop 1b
/* pseudo identity map the 3072-3090MB range */
movl $(512 * 8), %ecx
/* pseudo identity map the 3072-3102MB range */
movl $(512 * 16), %ecx
movl $(boot_pd3_pts - 0xc0000000), %edi
xorl %eax, %eax
@ -239,6 +249,7 @@ start:
movl $256, %ecx
movl $(boot_pd0_pt0 - 0xc0000000), %edi
xorl %eax, %eax
1:
movl %eax, 0(%edi)
addl $8, %edi
@ -317,19 +328,18 @@ apic_ap_start32:
movl $0x80000001, %eax
cpuid
testl $0x100000, %edx
// TODO: Uncomment this
//je (1f - apic_ap_start + 0x8000)
je (1f - apic_ap_start + 0x8000)
/* turn on IA32_EFER.NXE */
movl $0xc0000080, %ecx
rdmsr
orl $0x800, %eax
wrmsr
1:
/* load the bsp's cr3 value */
movl (ap_cpu_init_cr3 - apic_ap_start)(%ebp), %eax
movl %eax, %cr3
/* enable PAE + PSE */
movl %cr4, %eax
orl $0x60, %eax
@ -349,9 +359,9 @@ apic_ap_start32_2:
/* flush the TLB */
movl %cr3, %eax
movl %eax, %cr3
movl $0xc0008000, %ebp
/* now load the final gdt and idt from the identity mapped area */
movl (ap_cpu_gdtr - apic_ap_start)(%ebp), %eax
lgdt (%eax)
@ -363,20 +373,20 @@ apic_ap_start32_2:
movl %eax, %cr0
movl (ap_cpu_init_cr4 - apic_ap_start)(%ebp), %eax
movl %eax, %cr4
/* 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
movl 0(%eax, %esi, 4), %eax
push %eax
/* push the cpu id, 0 representing the bsp and call into c++ */
incl %esi
push %esi
xor %ebp, %ebp
cld
/* We are in identity mapped P0x8000 and the BSP will unload this code
once all APs are initialized, so call init_ap but return to our
infinite loop */