| #define __ASSEMBLY |
| #include "psr.h" |
| #include "asm/asi.h" |
| #include "cpustate.h" |
| #define ASI_BP ASI_M_BYPASS |
| #define REGWIN_SZ 0x40 |
| |
| .globl __switch_context, __switch_context_nosave, __exit_context, halt |
| |
| .text |
| .align 4 |
| |
| /* |
| * 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. |
| */ |
| |
| __switch_context: |
| FLUSH_ALL_KERNEL_WINDOWS |
| |
| /* Save everything in stack */ |
| st %g1, [%sp - 0x260 + 0x14] |
| st %g2, [%sp - 0x260 + 0x18] |
| st %g3, [%sp - 0x260 + 0x1c] |
| st %g4, [%sp - 0x260 + 0x20] |
| st %g5, [%sp - 0x260 + 0x24] |
| st %g6, [%sp - 0x260 + 0x28] |
| st %g7, [%sp - 0x260 + 0x2c] |
| |
| mov %sp, %g1 |
| add %g1, -0x260, %g1 |
| |
| SAVE_CPU_STATE(switch) |
| |
| /* Return PC value */ |
| mov %o7, %g2 |
| add %g2, 4, %g2 |
| st %g2, [%sp - 0x260 + 0x250] |
| |
| /* swap context */ |
| set __context, %g3 |
| ld [%g3], %g2 |
| st %g1, [%g3] |
| mov %g2, %g1 |
| |
| ba __set_context |
| nop |
| |
| __switch_context_nosave: |
| FLUSH_ALL_KERNEL_WINDOWS |
| |
| set __context, %g1 |
| ld [%g1], %g1 |
| |
| __set_context: |
| RESTORE_CPU_STATE(switch) |
| |
| /* Restore globals */ |
| mov %g1, %g2 |
| add %g2, 0x14, %g2 |
| st %g2, [%sp - 96] |
| |
| ld [%g1 + 0x18], %g2 |
| ld [%g1 + 0x1c], %g3 |
| ld [%g1 + 0x20], %g4 |
| ld [%g1 + 0x24], %g5 |
| ld [%g1 + 0x28], %g6 |
| ld [%g1 + 0x2c], %g7 |
| |
| /* Finally, load new %pc */ |
| ld [%g1 + 0x250], %g1 |
| jmpl %g1, %o7 |
| ld [%sp - 96], %g1 |
| |
| __exit_context: |
| /* Get back to the original context */ |
| ba __switch_context |
| nop |
