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/** @file sched_asm.S
*
* @brief scheduling functions.
*
* @author Hanjie Wu (hanjiew)
* @bug No functional bugs
*/
#include <x86/seg.h>
.text
.global set_fs
.type set_fs, %function
set_fs:
mov 0x4(%esp), %fs
ret
.global set_gs
.type set_gs, %function
set_gs:
mov 0x4(%esp), %gs
ret
.macro PERCPU_GETSET name offset
.global get_\name
.type get_\name, %function
get_\name:
xor %eax, %eax
mov %fs:\offset(%eax), %eax
ret
.global set_\name
.type set_\name, %function
set_\name:
xor %ecx, %ecx
mov 0x4(%esp), %eax
mov %eax, %fs:\offset(%ecx)
ret
.endm
PERCPU_GETSET current 0x0
PERCPU_GETSET idle 0x4
PERCPU_GETSET kthread 0x8
PERCPU_GETSET mapped_phys_page 0xc
PERCPU_GETSET mapped_phys_page_pte 0x10
.global return_to_user
.type return_to_user, %function
return_to_user:
push %esp
call check_pending_signals
add $0x4, %esp
pop %gs /* restore from stack_frame_t structure */
pop %fs
pop %es
pop %ds
popa
iret
.global switch_stack_cleanup
.type switch_stack_cleanup, %function
switch_stack_cleanup:
mov 0x8(%esp), %eax
mov 0x4(%esp), %esp
push %eax
call cleanup_dead_thread
add $0x4, %esp
pop %ebp
pop %ebx
pop %esi
pop %edi
popf
ret
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