Author: mcayland Date: Tue Dec 29 16:50:39 2015 New Revision: 1364 URL: http://tracker.coreboot.org/trac/openbios/changeset/1364 Log: SPARC64: move IMMU/DMMU miss handler stacks inline to the new Forth context stack Rather than having a separate OpenBIOS stack for IMMU/DMMU miss handlers, reuse the Forth context stack by reserving 8K extra beneath the CPU save state area and using that instead. Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Modified: trunk/openbios-devel/arch/sparc64/vectors.S Modified: trunk/openbios-devel/arch/sparc64/vectors.S ============================================================================== --- trunk/openbios-devel/arch/sparc64/vectors.S Tue Dec 29 16:50:36 2015 (r1363) +++ trunk/openbios-devel/arch/sparc64/vectors.S Tue Dec 29 16:50:39 2015 (r1364) @@ -276,17 +276,8 @@ .section ".data" .align 8 - .globl tlb_handler_stack_top, tlb_handler_stack_pointer, obp_ticks_pointer + .globl obp_ticks_pointer - ! Stack for the tlb MMU trap handlers -tlb_handler_stack_bottom: - .skip 8192 -tlb_handler_stack_top: - .skip 8 - - ! MMU trap handler stack pointer -tlb_handler_stack_pointer: - .xword tlb_handler_stack_top ! Pointer to current tick value obp_ticks_pointer: @@ -549,10 +540,17 @@ SAVE_CPU_STATE(dtlb) - /* Switch to TLB locked stack space (note we add an additional 192 bytes required for + /* Switch to 8K TLB locked OpenBIOS stack (note we add an additional 192 bytes required for gcc to save its arguments when building with -O0) */ - setx tlb_handler_stack_top, %g6, %g1 - add %g1, -STACK_BIAS - 192, %sp + setx _fcstack_ptr, %g6, %g7 + ldx [%g7], %g6 + setx 0x2000, %g4, %g5 + sub %g6, %g5, %g6 + stx %g6, [%g7] + + setx - 2047 - 192, %g6, %g7 + add %g1, %g7, %g7 + mov %g7, %sp /* Enable interrupts for window spill/fill traps */ rdpr %pstate, %g7 @@ -570,6 +568,9 @@ /* Restore CPU state from stack */ setx _fcstack_ptr, %g6, %g7 ldx [%g7], %g1 + setx 0x2000, %g4, %g5 + add %g1, %g5, %g1 + stx %g1, [%g7] RESTORE_CPU_STATE(dtlb) @@ -590,10 +591,17 @@ SAVE_CPU_STATE(itlb) - /* Switch to TLB locked stack space (note we add an additional 192 bytes required for + /* Switch to 8K TLB locked OpenBIOS stack (note we add an additional 192 bytes required for gcc to save its arguments when building with -O0) */ - setx tlb_handler_stack_top, %g6, %g1 - add %g1, -STACK_BIAS - 192, %sp + setx _fcstack_ptr, %g6, %g7 + ldx [%g7], %g6 + setx 0x2000, %g4, %g5 + sub %g6, %g5, %g6 + stx %g6, [%g7] + + setx - 2047 - 192, %g6, %g7 + add %g1, %g7, %g7 + mov %g7, %sp /* Enable interrupts for window spill/fill traps */ rdpr %pstate, %g7 @@ -611,6 +619,9 @@ /* Restore CPU state from stack */ setx _fcstack_ptr, %g6, %g7 ldx [%g7], %g1 + setx 0x2000, %g4, %g5 + add %g1, %g5, %g1 + stx %g1, [%g7] RESTORE_CPU_STATE(itlb)