diff options
Diffstat (limited to 'qemu/roms/openbios/arch/sparc64/cpustate.h')
| -rw-r--r-- | qemu/roms/openbios/arch/sparc64/cpustate.h | 244 |
1 files changed, 0 insertions, 244 deletions
diff --git a/qemu/roms/openbios/arch/sparc64/cpustate.h b/qemu/roms/openbios/arch/sparc64/cpustate.h deleted file mode 100644 index 0c276bfd1..000000000 --- a/qemu/roms/openbios/arch/sparc64/cpustate.h +++ /dev/null @@ -1,244 +0,0 @@ -/* - * Save/restore CPU state macros - * - * Copyright (C) 2015 Mark Cave-Ayland (mark.cave-ayland@ilande.co.uk>) - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * version 2 - * - */ - -/* State size for context (see below) */ -#define CONTEXT_STATE_SIZE 0x510 - -/* Stack size for context (allocated inline of the context stack) */ -#define CONTEXT_STACK_SIZE 0x2000 - -/* - * SAVE_CPU_STATE and RESTORE_CPU_STATE are macros used to enable a context switch - * to C to occur within the MMU I/D TLB miss handlers. - * - * Because these handlers are called on a TLB miss, we cannot use flushw to store - * processor window state on the stack, as the memory areas used by each window's - * stack pointer may not be in the TLB, causing recursive TLB miss traps. - * - * For this reason, we save window state by manually rotating the window registers - * and saving their contents (along with other vital registers) into a special - * tlb_handler_stack defined above which is guaranteed to be locked in the TLB, and - * so won't cause issues with trap recursion. - * - * Once this process is complete, we remain in a TL=0, CWP=0 state (with IE=1 to allow - * window fill/spill traps if required), switch to our safe tlb_handler_stack and - * invoke the miss handler. - */ - -#define SAVE_CPU_WINDOW_STATE(type) \ - /* Save window state into context at %g1 */ \ - rdpr %cwp, %g7; \ - stx %g7, [%g1]; \ - rdpr %cansave, %g7; \ - stx %g7, [%g1 + 0x8]; \ - rdpr %canrestore, %g7; \ - stx %g7, [%g1 + 0x10]; \ - rdpr %otherwin, %g7; \ - stx %g7, [%g1 + 0x18]; \ - rdpr %wstate, %g7; \ - stx %g7, [%g1 + 0x20]; \ - rdpr %cleanwin, %g7; \ - stx %g7, [%g1 + 0x28]; \ - \ - stx %o0, [%g1 + 0x30]; \ - stx %o1, [%g1 + 0x38]; \ - stx %o2, [%g1 + 0x40]; \ - stx %o3, [%g1 + 0x48]; \ - stx %o4, [%g1 + 0x50]; \ - stx %o5, [%g1 + 0x58]; \ - stx %o6, [%g1 + 0x60]; \ - stx %o7, [%g1 + 0x68]; \ - \ - rdpr %pstate, %g7; \ - stx %g7, [%g1 + 0x70]; \ - rd %y, %g7; \ - stx %g7, [%g1 + 0x78]; \ - rd %fprs, %g7; \ - stx %g7, [%g1 + 0x80]; \ - rdpr %tl, %g7; \ - stx %g7, [%g1 + 0x88]; \ - \ - /* Now iterate through all of the windows saving all l and i registers */ \ - add %g1, 0x90, %g5; \ - \ - /* Get the number of windows in %g6 */ \ - rdpr %ver, %g6; \ - and %g6, 0xf, %g6; \ - \ - mov %g6, %g4; \ - inc %g4; \ - \ - /* Starting cwp in g7 */ \ - rdpr %cwp, %g7; \ - \ -save_cpu_window_##type: \ - wrpr %g7, %cwp; \ - stx %l0, [%g5]; \ - stx %l1, [%g5 + 0x8]; \ - stx %l2, [%g5 + 0x10]; \ - stx %l3, [%g5 + 0x18]; \ - stx %l4, [%g5 + 0x20]; \ - stx %l5, [%g5 + 0x28]; \ - stx %l6, [%g5 + 0x30]; \ - stx %l7, [%g5 + 0x38]; \ - stx %i0, [%g5 + 0x40]; \ - stx %i1, [%g5 + 0x48]; \ - stx %i2, [%g5 + 0x50]; \ - stx %i3, [%g5 + 0x58]; \ - stx %i4, [%g5 + 0x60]; \ - stx %i5, [%g5 + 0x68]; \ - stx %i6, [%g5 + 0x70]; \ - stx %i7, [%g5 + 0x78]; \ - dec %g7; \ - and %g7, %g6, %g7; \ - subcc %g4, 1, %g4; \ - bne save_cpu_window_##type; \ - add %g5, 0x80, %g5; \ - \ - /* For 8 windows with 16 registers to save in the window, memory required \ - is 16*8*8 = 0x400 bytes */ \ - \ - /* Now we should be in window 0 so update the other window registers */ \ - rdpr %ver, %g6; \ - and %g6, 0xf, %g6; \ - dec %g6; \ - wrpr %g6, %cansave; \ - \ - wrpr %g0, %cleanwin; \ - wrpr %g0, %canrestore; \ - wrpr %g0, %otherwin; \ - - -#define SAVE_CPU_TRAP_STATE(type) \ - /* Save trap state into context at %g1 */ \ - add %g1, 0x490, %g5; \ - mov 4, %g6; \ - \ -save_trap_state_##type: \ - deccc %g6; \ - wrpr %g6, %tl; \ - rdpr %tpc, %g7; \ - stx %g7, [%g5]; \ - rdpr %tnpc, %g7; \ - stx %g7, [%g5 + 0x8]; \ - rdpr %tstate, %g7; \ - stx %g7, [%g5 + 0x10]; \ - rdpr %tt, %g7; \ - stx %g7, [%g5 + 0x18]; \ - bne save_trap_state_##type; \ - add %g5, 0x20, %g5; \ - \ - /* For 4 trap levels with 4 registers, memory required is \ - 4*8*4 = 0x80 bytes */ - -/* Save all state into context at %g1 */ -#define SAVE_CPU_STATE(type) \ - SAVE_CPU_WINDOW_STATE(type); \ - SAVE_CPU_TRAP_STATE(type); - - -#define RESTORE_CPU_WINDOW_STATE(type) \ - /* Restore window state from context at %g1 */ \ - \ - /* Get the number of windows in %g6 */ \ - rdpr %ver, %g6; \ - and %g6, 0xf, %g6; \ - \ - mov %g6, %g4; \ - inc %g4; \ - \ - /* Set starting window */ \ - ldx [%g1], %g7; \ - \ - /* Now iterate through all of the windows restoring all l and i registers */ \ - add %g1, 0x90, %g5; \ - \ -restore_cpu_window_##type: \ - wrpr %g7, %cwp; \ - ldx [%g5], %l0; \ - ldx [%g5 + 0x8], %l1; \ - ldx [%g5 + 0x10], %l2; \ - ldx [%g5 + 0x18], %l3; \ - ldx [%g5 + 0x20], %l4; \ - ldx [%g5 + 0x28], %l5; \ - ldx [%g5 + 0x30], %l6; \ - ldx [%g5 + 0x38], %l7; \ - ldx [%g5 + 0x40], %i0; \ - ldx [%g5 + 0x48], %i1; \ - ldx [%g5 + 0x50], %i2; \ - ldx [%g5 + 0x58], %i3; \ - ldx [%g5 + 0x60], %i4; \ - ldx [%g5 + 0x68], %i5; \ - ldx [%g5 + 0x70], %i6; \ - ldx [%g5 + 0x78], %i7; \ - dec %g7; \ - and %g7, %g6, %g7; \ - subcc %g4, 1, %g4; \ - bne restore_cpu_window_##type; \ - add %g5, 0x80, %g5; \ - \ - /* Restore the window registers to their original value */ \ - ldx [%g1], %g7; \ - wrpr %g7, %cwp; \ - ldx [%g1 + 0x8], %g7; \ - wrpr %g7, %cansave; \ - ldx [%g1 + 0x10], %g7; \ - wrpr %g7, %canrestore; \ - ldx [%g1 + 0x18], %g7; \ - wrpr %g7, %otherwin; \ - ldx [%g1 + 0x20], %g7; \ - wrpr %g7, %wstate; \ - ldx [%g1 + 0x28], %g7; \ - wrpr %g7, %cleanwin; \ - \ - ldx [%g1 + 0x30], %o0; \ - ldx [%g1 + 0x38], %o1; \ - ldx [%g1 + 0x40], %o2; \ - ldx [%g1 + 0x48], %o3; \ - ldx [%g1 + 0x50], %o4; \ - ldx [%g1 + 0x58], %o5; \ - ldx [%g1 + 0x60], %o6; \ - ldx [%g1 + 0x68], %o7; \ - \ - ldx [%g1 + 0x70], %g7; \ - wrpr %g7, %pstate; \ - ldx [%g1 + 0x78], %g7; \ - wr %g7, 0, %y; \ - ldx [%g1 + 0x80], %g7; \ - wr %g7, 0, %fprs; \ - - -#define RESTORE_CPU_TRAP_STATE(type) \ - /* Restore trap state from context at %g1 */ \ - add %g1, 0x490, %g5; \ - mov 4, %g6; \ - \ -restore_trap_state_##type: \ - deccc %g6; \ - wrpr %g6, %tl; \ - ldx [%g5], %g7; \ - wrpr %g7, %tpc; \ - ldx [%g5 + 0x8], %g7; \ - wrpr %g7, %tnpc; \ - ldx [%g5 + 0x10], %g7; \ - wrpr %g7, %tstate; \ - ldx [%g5 + 0x18], %g7; \ - wrpr %g7, %tt; \ - bne restore_trap_state_##type; \ - add %g5, 0x20, %g5; \ - \ - ldx [%g1 + 0x88], %g7; \ - wrpr %g7, %tl - -/* Restore all state from context at %g1 */ -#define RESTORE_CPU_STATE(type) \ - RESTORE_CPU_WINDOW_STATE(type); \ - RESTORE_CPU_TRAP_STATE(type); |