mirror of
https://gitlab.com/qemu-project/openbios.git
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ad82fa58a6
git-svn-id: svn://coreboot.org/openbios/openbios-devel@24 f158a5a8-5612-0410-a976-696ce0be7e32
124 lines
3.2 KiB
ArmAsm
124 lines
3.2 KiB
ArmAsm
#include "psr.h"
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#include "asi.h"
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#define ASI_BP ASI_M_BYPASS
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#define REGWIN_SZ 0x40
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.globl __switch_context, __switch_context_nosave, __exit_context, halt
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.text
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.align 4
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/*
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* Switch execution context
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* This saves registers in the stack, then
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* switches the stack, and restores everything from the new stack.
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* This function takes no argument. New stack pointer is
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* taken from global variable __context, and old stack pointer
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* is also saved to __context. This way we can just jump to
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* this routine to get back to the original context.
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*/
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/* XXX: totally bogus for sparc, need to save and restore all windows */
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__switch_context:
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/* Save everything in current stack */
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set __context, %g1
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st %g2, [%g1 + 8]
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st %g3, [%g1 + 12]
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st %g4, [%g1 + 16]
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st %g5, [%g1 + 20]
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st %g6, [%g1 + 24]
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st %g7, [%g1 + 28]
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st %o0, [%g1 + 32]
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st %o1, [%g1 + 36]
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st %o2, [%g1 + 40]
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st %o3, [%g1 + 44]
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st %o4, [%g1 + 48]
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st %o5, [%g1 + 52]
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st %o6, [%g1 + 56]
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st %o7, [%g1 + 60]
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st %l0, [%g1 + 64]
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st %l1, [%g1 + 68]
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st %l2, [%g1 + 72]
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st %l3, [%g1 + 76]
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st %l4, [%g1 + 80]
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st %l5, [%g1 + 84]
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st %l6, [%g1 + 88]
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st %l7, [%g1 + 92]
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st %i0, [%g1 + 96]
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st %i1, [%g1 + 100]
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st %i2, [%g1 + 104]
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st %i3, [%g1 + 108]
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st %i4, [%g1 + 112]
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st %i5, [%g1 + 116]
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st %i6, [%g1 + 120]
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st %i7, [%g1 + 124]
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__switch_context_nosave:
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/* Interrupts are not allowed... */
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/* Turn on Supervisor, EnableFloating, and all the PIL bits.
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* Also puts us in register window zero with traps off.
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*/
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#if 0
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set (PSR_PS | PSR_S | PSR_PIL | PSR_EF), %g2
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wr %g2, 0x0, %psr
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#endif
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/* Load all registers
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*/
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set __context, %g1
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ld [%g1], %g1
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ld [%g1 + 8], %g2
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ld [%g1 + 12], %g3
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ld [%g1 + 16], %g4
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ld [%g1 + 20], %g5
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ld [%g1 + 24], %g6
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ld [%g1 + 28], %g7
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ld [%g1 + 32], %o0
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ld [%g1 + 36], %o1
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ld [%g1 + 40], %o2
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ld [%g1 + 44], %o3
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ld [%g1 + 48], %o4
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ld [%g1 + 52], %o5
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ld [%g1 + 56], %o6
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ld [%g1 + 60], %o7
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ld [%g1 + 64], %l0
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ld [%g1 + 68], %l1
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ld [%g1 + 72], %l2
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ld [%g1 + 76], %l3
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ld [%g1 + 80], %l4
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ld [%g1 + 84], %l5
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ld [%g1 + 88], %l6
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ld [%g1 + 92], %l7
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ld [%g1 + 96], %i0
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ld [%g1 + 100], %i1
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ld [%g1 + 104], %i2
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ld [%g1 + 108], %i3
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ld [%g1 + 112], %i4
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ld [%g1 + 116], %i5
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ld [%g1 + 120], %i6
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ld [%g1 + 124], %i7
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ld [%g1 + 128], %g1
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/* Finally, load new %pc */
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jmp %g1
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clr %g1
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__exit_context:
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/* Get back to the original context */
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call __switch_context
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nop
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/* We get here if the other context attempt to switch to this
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* dead context. This should not happen. */
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halt:
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b halt
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nop
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