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hw_x86_64: Use mtc relative addressing for _mt_buffer in crt0.s 

Until the kernel page tables are active, labels can't be used directly
because the associated pages are not mapped for non-core threads.
This commit is contained in:
Reto Buerki 2015-02-27 13:25:19 +01:00 committed by Christian Helmuth
parent 09c90e5751
commit 080d7d5f8b
1 changed files with 4 additions and 2 deletions
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6
repos/base-hw/src/core/spec/x86_64/mode_transition.s
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@ -32,6 +32,8 @@
/* tss segment limit */ /* tss segment limit */
.set TSS_LIMIT, 0x68 .set TSS_LIMIT, 0x68
/* mtc virt addresses */
.set MT_BUFFER, _mt_buffer - _mt_begin
.macro _isr_entry .macro _isr_entry
.align 4, 0x90 .align 4, 0x90
.endm .endm
@ -126,7 +128,7 @@
_mt_kernel_entry_pic: _mt_kernel_entry_pic:
/* Copy client context RAX to buffer */ /* Copy client context RAX to buffer */
mov %rax, _mt_buffer mov %rax, MT_BUFFER
/* Switch to kernel page tables */ /* Switch to kernel page tables */
mov _mt_master_context_begin+CR3_OFFSET, %rax mov _mt_master_context_begin+CR3_OFFSET, %rax
@ -235,7 +237,7 @@
mov %rax, %cr3 mov %rax, %cr3
/* Set stack back to mt buffer and restore client RAX */ /* Set stack back to mt buffer and restore client RAX */
mov $_mt_buffer, %rsp mov $MT_BUFFER, %rsp
popq %rax popq %rax
iretq iretq