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Initial support for 64 bit coreboot

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This commit is contained in:
bzt 2020-10-02 21:03:22 +02:00
parent dfd763fec4
commit 0ab9508e80
1 changed files with 19 additions and 9 deletions
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28
x86_64-cb/smp.S
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@ -90,6 +90,11 @@ GDT_value:
.word GDT_value - GDT_table - 1
.long GDT_table, 0, 0
.word 0
.align 8
stack64:
.long bit64
.long 0
.quad 8
/*****************************************************************************
* things to do on BSP *
@ -137,15 +142,20 @@ bsp64_init:
orb $0x80, %al
outb %al, $0x70
incb 0x1010 // release AP spin lock
movl $0x368, %eax // Set PAE, MCE, PGE; OSFXSR, OSXMMEXCPT (enable SSE)
movl %eax, %cr4
movl $0x4000, %eax
movl %eax, %cr3
movl $0x0C0000080, %ecx // EFR MSR
movl $0x0C0000011, %eax // clear EM, MP (enable SSE) and WP
movl %eax, %cr0
lgdt GDT_value
ljmp $8, $bit64
xorq %rax, %rax
movl $0xC0000011, %eax // enable SSE
movq %rax, %cr0
movq %cr4, %rax
orw $3 << 8, %ax
mov %rax, %cr4
movl $0x4000, %eax // set up paging
movq %rax, %cr3
xorq %rax, %rax
movl $GDT_value, %eax
lgdt (%rax)
movl $stack64, %eax // reload CS, that's tricky in long mode because ljmp doesn't work
movq %rax, %rsp
lretq
bit64:
movl $0x10, %eax // load long mode segments