mirror of
https://gitlab.com/qemu-project/openbios.git
synced 2024-02-13 08:34:06 +08:00
3409ec8b13
git-svn-id: svn://coreboot.org/openbios/openbios-devel@190 f158a5a8-5612-0410-a976-696ce0be7e32
119 lines
3.2 KiB
ArmAsm
119 lines
3.2 KiB
ArmAsm
#include "pstate.h"
|
|
#include "asi.h"
|
|
#define ASI_BP ASI_M_BYPASS
|
|
#define REGWIN_SZ 0x40
|
|
|
|
.globl __switch_context, __switch_context_nosave, __exit_context, halt
|
|
|
|
.text
|
|
.align 4
|
|
.register %g2, #scratch
|
|
.register %g3, #scratch
|
|
.register %g6, #scratch
|
|
.register %g7, #scratch
|
|
|
|
/*
|
|
* Switch execution context
|
|
* This saves registers in the stack, then
|
|
* switches the stack, and restores everything from the new stack.
|
|
* This function takes no argument. New stack pointer is
|
|
* taken from global variable __context, and old stack pointer
|
|
* is also saved to __context. This way we can just jump to
|
|
* this routine to get back to the original context.
|
|
*/
|
|
|
|
/* XXX: totally bogus for sparc, need to save and restore all windows */
|
|
__switch_context:
|
|
/* Save everything in current stack */
|
|
setx __context, %g2, %g1
|
|
stx %g3, [%g1 + 24]
|
|
stx %g4, [%g1 + 32]
|
|
stx %g5, [%g1 + 40]
|
|
stx %g6, [%g1 + 48]
|
|
stx %g7, [%g1 + 56]
|
|
|
|
stx %o0, [%g1 + 64]
|
|
stx %o1, [%g1 + 72]
|
|
stx %o2, [%g1 + 80]
|
|
stx %o3, [%g1 + 88]
|
|
stx %o4, [%g1 + 96]
|
|
stx %o5, [%g1 + 104]
|
|
stx %o6, [%g1 + 112]
|
|
stx %o7, [%g1 + 120]
|
|
|
|
stx %l0, [%g1 + 128]
|
|
stx %l1, [%g1 + 136]
|
|
stx %l2, [%g1 + 144]
|
|
stx %l3, [%g1 + 152]
|
|
stx %l4, [%g1 + 160]
|
|
stx %l5, [%g1 + 168]
|
|
stx %l6, [%g1 + 176]
|
|
stx %l7, [%g1 + 184]
|
|
|
|
stx %i0, [%g1 + 192]
|
|
stx %i1, [%g1 + 200]
|
|
stx %i2, [%g1 + 208]
|
|
stx %i3, [%g1 + 216]
|
|
stx %i4, [%g1 + 224]
|
|
stx %i5, [%g1 + 232]
|
|
stx %i6, [%g1 + 240]
|
|
stx %i7, [%g1 + 248]
|
|
|
|
__switch_context_nosave:
|
|
/* Interrupts are not allowed... */
|
|
|
|
/* Load all registers
|
|
*/
|
|
setx __context, %g2, %g1
|
|
ldx [%g1], %g1
|
|
ldx [%g1 + 16], %g2
|
|
ldx [%g1 + 24], %g3
|
|
ldx [%g1 + 32], %g4
|
|
ldx [%g1 + 40], %g5
|
|
ldx [%g1 + 48], %g6
|
|
ldx [%g1 + 56], %g7
|
|
|
|
ldx [%g1 + 64], %o0
|
|
ldx [%g1 + 72], %o1
|
|
ldx [%g1 + 80], %o2
|
|
ldx [%g1 + 88], %o3
|
|
ldx [%g1 + 96], %o4
|
|
ldx [%g1 + 104], %o5
|
|
ldx [%g1 + 112], %o6
|
|
ldx [%g1 + 120], %o7
|
|
|
|
ldx [%g1 + 128], %l0
|
|
ldx [%g1 + 136], %l1
|
|
ldx [%g1 + 144], %l2
|
|
ldx [%g1 + 152], %l3
|
|
ldx [%g1 + 160], %l4
|
|
ldx [%g1 + 168], %l5
|
|
ldx [%g1 + 176], %l6
|
|
ldx [%g1 + 184], %l7
|
|
|
|
ldx [%g1 + 192], %i0
|
|
ldx [%g1 + 200], %i1
|
|
ldx [%g1 + 208], %i2
|
|
ldx [%g1 + 216], %i3
|
|
ldx [%g1 + 224], %i4
|
|
ldx [%g1 + 232], %i5
|
|
ldx [%g1 + 240], %i6
|
|
ldx [%g1 + 248], %i7
|
|
|
|
ldx [%g1 + 256], %g1
|
|
/* Finally, load new %pc */
|
|
jmp %g1
|
|
clr %g1
|
|
|
|
__exit_context:
|
|
/* Get back to the original context */
|
|
call __switch_context
|
|
nop
|
|
|
|
/* We get here if the other context attempt to switch to this
|
|
* dead context. This should not happen. */
|
|
|
|
halt:
|
|
b halt
|
|
nop
|