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-rw-r--r--qemu/roms/openbios/arch/sparc64/call-client.S218
-rw-r--r--qemu/roms/openbios/arch/sparc64/context.c4
-rw-r--r--qemu/roms/openbios/arch/sparc64/cpustate.h244
-rw-r--r--qemu/roms/openbios/arch/sparc64/ldscript5
-rw-r--r--qemu/roms/openbios/arch/sparc64/lib.c4
-rw-r--r--qemu/roms/openbios/arch/sparc64/vectors.S300
6 files changed, 368 insertions, 407 deletions
diff --git a/qemu/roms/openbios/arch/sparc64/call-client.S b/qemu/roms/openbios/arch/sparc64/call-client.S
index f365e3cb1..a8c0348e4 100644
--- a/qemu/roms/openbios/arch/sparc64/call-client.S
+++ b/qemu/roms/openbios/arch/sparc64/call-client.S
@@ -1,3 +1,5 @@
+#include "cpustate.h"
+
.globl sparc64_of_client_interface, client_tba
@@ -9,151 +11,9 @@
* behaviour of OBP.
*/
-#define SAVE_WINDOW_STATE(type) \
- setx client_window, %g6, %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]; \
- \
- /* 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; \
- inc %g6; \
- \
-save_cpu_window_##type: \
- deccc %g6; \
- wrpr %g6, %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]; \
- 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 RESTORE_WINDOW_STATE(type) \
- setx client_window, %g6, %g1; \
- \
- /* Get the number of windows in %g6 */ \
- rdpr %ver, %g6; \
- and %g6, 0xf, %g6; \
- inc %g6; \
- \
- /* Now iterate through all of the windows restoring all l and i registers */ \
- add %g1, 0x90, %g5; \
- \
-restore_cpu_window_##type: \
- deccc %g6; \
- wrpr %g6, %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; \
- 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
-
-
.data
.align 8
- .skip 16384
-openbios_stack:
-
client_stack:
.xword 0
client_tba:
@@ -176,15 +36,15 @@ client_window:
sparc64_of_client_interface:
/* Save globals on callers stack */
- add %sp, -56, %sp
+ add %sp, -248, %sp
- stx %g1, [%sp + 2047 + 0]
- stx %g2, [%sp + 2047 + 8]
- stx %g3, [%sp + 2047 + 16]
- stx %g4, [%sp + 2047 + 24]
- stx %g5, [%sp + 2047 + 32]
- stx %g6, [%sp + 2047 + 40]
- stx %g7, [%sp + 2047 + 48]
+ stx %g1, [%sp + 2047 + 192]
+ stx %g2, [%sp + 2047 + 200]
+ stx %g3, [%sp + 2047 + 208]
+ stx %g4, [%sp + 2047 + 216]
+ stx %g5, [%sp + 2047 + 224]
+ stx %g6, [%sp + 2047 + 232]
+ stx %g7, [%sp + 2047 + 240]
/* Save client trap table */
setx client_tba, %g6, %g7
@@ -196,22 +56,44 @@ sparc64_of_client_interface:
stx %sp, [%g7]
/* Save windows */
- SAVE_WINDOW_STATE(cif)
-
- /* Move to OpenBIOS stack */
- setx openbios_stack - 2047 - 192, %g6, %g7
+ setx _fcstack_ptr, %g6, %g7
+ ldx [%g7], %g1
+ add %g1, -CONTEXT_STATE_SIZE, %g1
+ stx %g1, [%g7]
+
+ SAVE_CPU_WINDOW_STATE(cif)
+
+ /* Move to OpenBIOS context stack */
+ setx _fcstack_ptr, %g6, %g7
+ ldx [%g7], %g6
+ setx CONTEXT_STACK_SIZE, %g4, %g5
+ sub %g6, %g5, %g6
+ stx %g6, [%g7]
+
+ setx - 2047 - 192, %g6, %g7
+ add %g1, %g7, %g7
mov %g7, %sp
/* Call client inteface */
call of_client_interface
ldx [%g1 + 0x30], %o0
- setx client_window, %g6, %g1
- stx %o0, [%g1 + 0x30]
-
/* Restore windows */
- RESTORE_WINDOW_STATE(cif)
-
+ setx _fcstack_ptr, %g6, %g7
+ ldx [%g7], %g1
+ setx CONTEXT_STACK_SIZE, %g4, %g5
+ add %g1, %g5, %g1
+ stx %g1, [%g7]
+
+ /* Return value */
+ stx %o0, [%g1 + 0x30]
+
+ RESTORE_CPU_WINDOW_STATE(cif)
+
+ add %g1, CONTEXT_STATE_SIZE, %g1
+ setx _fcstack_ptr, %g6, %g7
+ stx %g1, [%g7]
+
/* Restore stack */
setx client_stack, %g6, %g7
ldx [%g7], %sp
@@ -222,15 +104,15 @@ sparc64_of_client_interface:
wrpr %g6, %tba
/* Restore globals */
- ldx [%sp + 2047 + 0], %g1
- ldx [%sp + 2047 + 8], %g2
- ldx [%sp + 2047 + 16], %g3
- ldx [%sp + 2047 + 24], %g4
- ldx [%sp + 2047 + 32], %g5
- ldx [%sp + 2047 + 40], %g6
- ldx [%sp + 2047 + 48], %g7
-
- add %sp, 56, %sp
+ ldx [%sp + 2047 + 192], %g1
+ ldx [%sp + 2047 + 200], %g2
+ ldx [%sp + 2047 + 208], %g3
+ ldx [%sp + 2047 + 216], %g4
+ ldx [%sp + 2047 + 224], %g5
+ ldx [%sp + 2047 + 232], %g6
+ ldx [%sp + 2047 + 240], %g7
+
+ add %sp, 248, %sp
jmp %o7+8
nop
diff --git a/qemu/roms/openbios/arch/sparc64/context.c b/qemu/roms/openbios/arch/sparc64/context.c
index 2e7668958..98932ee9c 100644
--- a/qemu/roms/openbios/arch/sparc64/context.c
+++ b/qemu/roms/openbios/arch/sparc64/context.c
@@ -40,6 +40,10 @@ static uint8_t image_stack[IMAGE_STACK_SIZE];
/* Pointer to startup context (physical address) */
unsigned long __boot_ctx;
+/* Pointer to Forth context stack */
+void *_fcstack_ptr = &_efcstack;
+
+
/*
* Main starter
* This is the C function that runs first.
diff --git a/qemu/roms/openbios/arch/sparc64/cpustate.h b/qemu/roms/openbios/arch/sparc64/cpustate.h
new file mode 100644
index 000000000..0c276bfd1
--- /dev/null
+++ b/qemu/roms/openbios/arch/sparc64/cpustate.h
@@ -0,0 +1,244 @@
+/*
+ * 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);
diff --git a/qemu/roms/openbios/arch/sparc64/ldscript b/qemu/roms/openbios/arch/sparc64/ldscript
index 54288e825..c5cc6a5ce 100644
--- a/qemu/roms/openbios/arch/sparc64/ldscript
+++ b/qemu/roms/openbios/arch/sparc64/ldscript
@@ -50,6 +50,11 @@ SECTIONS
*(.bss.*)
*(COMMON)
+ _fcstack = .;
+ . += 32768;
+ . = ALIGN(16);
+ _efcstack = .;
+
_stack = .;
. += STACK_SIZE;
. = ALIGN(16);
diff --git a/qemu/roms/openbios/arch/sparc64/lib.c b/qemu/roms/openbios/arch/sparc64/lib.c
index e9101af52..4709ca8fe 100644
--- a/qemu/roms/openbios/arch/sparc64/lib.c
+++ b/qemu/roms/openbios/arch/sparc64/lib.c
@@ -458,10 +458,10 @@ NODE_METHODS(mmu) = {
void ob_mmu_init(const char *cpuname, uint64_t ram_size)
{
/* memory node */
- REGISTER_NODE_METHODS(memory, "/memory");
+ REGISTER_NODE(memory);
/* MMU node */
- REGISTER_NODE_METHODS(mmu, "/virtual-memory");
+ REGISTER_NODE(mmu);
ofmem_register(find_dev("/memory"), find_dev("/virtual-memory"));
diff --git a/qemu/roms/openbios/arch/sparc64/vectors.S b/qemu/roms/openbios/arch/sparc64/vectors.S
index 927c1cdc7..9d86b6bd8 100644
--- a/qemu/roms/openbios/arch/sparc64/vectors.S
+++ b/qemu/roms/openbios/arch/sparc64/vectors.S
@@ -24,6 +24,7 @@
*/
#define __ASSEMBLY__
+#include "cpustate.h"
#include "pstate.h"
#include <asm/asi.h>
#define ASI_BP ASI_PHYS_BYPASS_EC_E
@@ -276,17 +277,8 @@ tl1_resv1f0: BTRAPS(0x1f0) BTRAPS(0x1f8)
.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:
@@ -336,234 +328,30 @@ fill_32bit:
restored
retry
-/*
- * 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_STATE(type) \
- /* Set up our exception stack pointer in %g1 */ \
- setx tlb_handler_stack_pointer, %g7, %g6; \
- ldx [%g6], %g1; \
- add %g1, -0x510, %g1; \
- \
- /* First save the various state registers */ \
- 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]; \
- rdpr %pstate, %g7; \
- stx %g7, [%g1 + 0x30]; \
- \
- rd %y, %g7; \
- stx %g7, [%g1 + 0x38]; \
- rd %fprs, %g7; \
- stx %g7, [%g1 + 0x40]; \
- \
- rdpr %tl, %g7; \
- stx %g7, [%g1 + 0x48]; \
- \
- /* Trap state */ \
- add %g1, 0x50, %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 the o registers */ \
- stx %o0, [%g1 + 0xd0]; \
- stx %o1, [%g1 + 0xd8]; \
- stx %o2, [%g1 + 0xe0]; \
- stx %o3, [%g1 + 0xe8]; \
- stx %o4, [%g1 + 0xf0]; \
- stx %o5, [%g1 + 0xf8]; \
- stx %o6, [%g1 + 0x100]; \
- stx %o7, [%g1 + 0x108]; \
- \
- /* Now iterate through all of the windows saving all l and i registers */ \
- add %g1, 0x110, %g5; \
- \
- /* Get the number of windows in %g6 */ \
- rdpr %ver, %g6; \
- and %g6, 0xf, %g6; \
- inc %g6; \
- \
-save_cpu_window_##type: \
- deccc %g6; \
- wrpr %g6, %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]; \
- 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; \
- \
- /* Update our exception stack pointer */ \
- setx tlb_handler_stack_pointer, %g7, %g6; \
- stx %g1, [%g6];
-
-
-#define RESTORE_CPU_STATE(type) \
- /* Set up our exception stack pointer in %g1 */ \
- setx tlb_handler_stack_pointer, %g7, %g6; \
- ldx [%g6], %g1; \
- \
- /* Get the number of windows in %g6 */ \
- rdpr %ver, %g6; \
- and %g6, 0xf, %g6; \
- inc %g6; \
- \
- /* Now iterate through all of the windows restoring all l and i registers */ \
- add %g1, 0x110, %g5; \
- \
-restore_cpu_window_##type: \
- deccc %g6; \
- wrpr %g6, %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; \
- 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], %g7; \
- wrpr %g7, %pstate; \
- \
- /* Restore the o registers */ \
- ldx [%g1 + 0xd0], %o0; \
- ldx [%g1 + 0xd8], %o1; \
- ldx [%g1 + 0xe0], %o2; \
- ldx [%g1 + 0xe8], %o3; \
- ldx [%g1 + 0xf0], %o4; \
- ldx [%g1 + 0xf8], %o5; \
- ldx [%g1 + 0x100], %o6; \
- ldx [%g1 + 0x108], %o7; \
- \
- /* Restore the trap state */ \
- add %g1, 0x50, %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 + 0x38], %g7; \
- wr %g7, 0, %y; \
- ldx [%g1 + 0x40], %g7; \
- wr %g7, 0, %fprs; \
- ldx [%g1 + 0x48], %g7; \
- wrpr %g7, %tl; \
- \
- /* Restore exception stack pointer to previous value */ \
- setx tlb_handler_stack_pointer, %g7, %g6; \
- add %g1, 0x510, %g1; \
- stx %g1, [%g6];
-
.globl reload_DMMU_tlb, reload_IMMU_tlb, bug
reload_DMMU_tlb:
-
+
+ /* Save CPU state to stack */
+ setx _fcstack_ptr, %g6, %g7
+ ldx [%g7], %g1
+ add %g1, -CONTEXT_STATE_SIZE, %g1
+ stx %g1, [%g7]
+
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) */
- add %g1, -STACK_BIAS - 192, %sp
+ setx _fcstack_ptr, %g6, %g7
+ ldx [%g7], %g6
+ setx CONTEXT_STACK_SIZE, %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
@@ -577,18 +365,44 @@ reload_DMMU_tlb:
rdpr %pstate, %g7
andn %g7, PSTATE_IE, %g7
wrpr %g7, %pstate
-
+
+ /* Restore CPU state from stack */
+ setx _fcstack_ptr, %g6, %g7
+ ldx [%g7], %g1
+ setx CONTEXT_STACK_SIZE, %g4, %g5
+ add %g1, %g5, %g1
+ stx %g1, [%g7]
+
RESTORE_CPU_STATE(dtlb)
-
+
+ setx _fcstack_ptr, %g6, %g7
+ ldx [%g7], %g1
+ add %g1, CONTEXT_STATE_SIZE, %g1
+ stx %g1, [%g7]
+
retry
reload_IMMU_tlb:
-
+
+ /* Save CPU state to stack */
+ setx _fcstack_ptr, %g6, %g7
+ ldx [%g7], %g1
+ add %g1, -CONTEXT_STATE_SIZE, %g1
+ stx %g1, [%g7]
+
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) */
- add %g1, -STACK_BIAS - 192, %sp
+ setx _fcstack_ptr, %g6, %g7
+ ldx [%g7], %g6
+ setx CONTEXT_STACK_SIZE, %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
@@ -602,8 +416,20 @@ reload_IMMU_tlb:
rdpr %pstate, %g7
andn %g7, PSTATE_IE, %g7
wrpr %g7, %pstate
-
+
+ /* Restore CPU state from stack */
+ setx _fcstack_ptr, %g6, %g7
+ ldx [%g7], %g1
+ setx CONTEXT_STACK_SIZE, %g4, %g5
+ add %g1, %g5, %g1
+ stx %g1, [%g7]
+
RESTORE_CPU_STATE(itlb)
+
+ setx _fcstack_ptr, %g6, %g7
+ ldx [%g7], %g1
+ add %g1, CONTEXT_STATE_SIZE, %g1
+ stx %g1, [%g7]
retry