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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-17 02:20:36 +0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-17 02:20:36 +0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/mips/kernel/genex.S
downloadlinux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1994 - 2000, 2001, 2003 Ralf Baechle
+ * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
+ * Copyright (C) 2001 MIPS Technologies, Inc.
+ * Copyright (C) 2002 Maciej W. Rozycki
+ */
+#include <linux/config.h>
+#include <linux/init.h>
+
+#include <asm/asm.h>
+#include <asm/cacheops.h>
+#include <asm/regdef.h>
+#include <asm/fpregdef.h>
+#include <asm/mipsregs.h>
+#include <asm/stackframe.h>
+#include <asm/war.h>
+
+#define PANIC_PIC(msg) \
+ .set push; \
+ .set reorder; \
+ PTR_LA a0,8f; \
+ .set noat; \
+ PTR_LA AT, panic; \
+ jr AT; \
+9: b 9b; \
+ .set pop; \
+ TEXT(msg)
+
+ __INIT
+
+NESTED(except_vec0_generic, 0, sp)
+ PANIC_PIC("Exception vector 0 called")
+ END(except_vec0_generic)
+
+NESTED(except_vec1_generic, 0, sp)
+ PANIC_PIC("Exception vector 1 called")
+ END(except_vec1_generic)
+
+/*
+ * General exception vector for all other CPUs.
+ *
+ * Be careful when changing this, it has to be at most 128 bytes
+ * to fit into space reserved for the exception handler.
+ */
+NESTED(except_vec3_generic, 0, sp)
+ .set push
+ .set noat
+#if R5432_CP0_INTERRUPT_WAR
+ mfc0 k0, CP0_INDEX
+#endif
+ mfc0 k1, CP0_CAUSE
+ andi k1, k1, 0x7c
+#ifdef CONFIG_MIPS64
+ dsll k1, k1, 1
+#endif
+ PTR_L k0, exception_handlers(k1)
+ jr k0
+ .set pop
+ END(except_vec3_generic)
+
+/*
+ * General exception handler for CPUs with virtual coherency exception.
+ *
+ * Be careful when changing this, it has to be at most 256 (as a special
+ * exception) bytes to fit into space reserved for the exception handler.
+ */
+NESTED(except_vec3_r4000, 0, sp)
+ .set push
+ .set mips3
+ .set noat
+ mfc0 k1, CP0_CAUSE
+ li k0, 31<<2
+ andi k1, k1, 0x7c
+ .set push
+ .set noreorder
+ .set nomacro
+ beq k1, k0, handle_vced
+ li k0, 14<<2
+ beq k1, k0, handle_vcei
+#ifdef CONFIG_MIPS64
+ dsll k1, k1, 1
+#endif
+ .set pop
+ PTR_L k0, exception_handlers(k1)
+ jr k0
+
+ /*
+ * Big shit, we now may have two dirty primary cache lines for the same
+ * physical address. We can savely invalidate the line pointed to by
+ * c0_badvaddr because after return from this exception handler the
+ * load / store will be re-executed.
+ */
+handle_vced:
+ DMFC0 k0, CP0_BADVADDR
+ li k1, -4 # Is this ...
+ and k0, k1 # ... really needed?
+ mtc0 zero, CP0_TAGLO
+ cache Index_Store_Tag_D,(k0)
+ cache Hit_Writeback_Inv_SD,(k0)
+#ifdef CONFIG_PROC_FS
+ PTR_LA k0, vced_count
+ lw k1, (k0)
+ addiu k1, 1
+ sw k1, (k0)
+#endif
+ eret
+
+handle_vcei:
+ MFC0 k0, CP0_BADVADDR
+ cache Hit_Writeback_Inv_SD, (k0) # also cleans pi
+#ifdef CONFIG_PROC_FS
+ PTR_LA k0, vcei_count
+ lw k1, (k0)
+ addiu k1, 1
+ sw k1, (k0)
+#endif
+ eret
+ .set pop
+ END(except_vec3_r4000)
+
+/*
+ * Special interrupt vector for MIPS64 ISA & embedded MIPS processors.
+ * This is a dedicated interrupt exception vector which reduces the
+ * interrupt processing overhead. The jump instruction will be replaced
+ * at the initialization time.
+ *
+ * Be careful when changing this, it has to be at most 128 bytes
+ * to fit into space reserved for the exception handler.
+ */
+NESTED(except_vec4, 0, sp)
+1: j 1b /* Dummy, will be replaced */
+ END(except_vec4)
+
+/*
+ * EJTAG debug exception handler.
+ * The EJTAG debug exception entry point is 0xbfc00480, which
+ * normally is in the boot PROM, so the boot PROM must do a
+ * unconditional jump to this vector.
+ */
+NESTED(except_vec_ejtag_debug, 0, sp)
+ j ejtag_debug_handler
+ END(except_vec_ejtag_debug)
+
+ __FINIT
+
+/*
+ * EJTAG debug exception handler.
+ */
+NESTED(ejtag_debug_handler, PT_SIZE, sp)
+ .set push
+ .set noat
+ MTC0 k0, CP0_DESAVE
+ mfc0 k0, CP0_DEBUG
+
+ sll k0, k0, 30 # Check for SDBBP.
+ bgez k0, ejtag_return
+
+ PTR_LA k0, ejtag_debug_buffer
+ LONG_S k1, 0(k0)
+ SAVE_ALL
+ move a0, sp
+ jal ejtag_exception_handler
+ RESTORE_ALL
+ PTR_LA k0, ejtag_debug_buffer
+ LONG_L k1, 0(k0)
+
+ejtag_return:
+ MFC0 k0, CP0_DESAVE
+ .set mips32
+ deret
+ .set pop
+ END(ejtag_debug_handler)
+
+/*
+ * This buffer is reserved for the use of the EJTAG debug
+ * handler.
+ */
+ .data
+EXPORT(ejtag_debug_buffer)
+ .fill LONGSIZE
+ .previous
+
+ __INIT
+
+/*
+ * NMI debug exception handler for MIPS reference boards.
+ * The NMI debug exception entry point is 0xbfc00000, which
+ * normally is in the boot PROM, so the boot PROM must do a
+ * unconditional jump to this vector.
+ */
+NESTED(except_vec_nmi, 0, sp)
+ j nmi_handler
+ END(except_vec_nmi)
+
+ __FINIT
+
+NESTED(nmi_handler, PT_SIZE, sp)
+ .set push
+ .set noat
+ .set mips3
+ SAVE_ALL
+ move a0, sp
+ jal nmi_exception_handler
+ RESTORE_ALL
+ eret
+ .set pop
+ END(nmi_handler)
+
+ .macro __build_clear_none
+ .endm
+
+ .macro __build_clear_sti
+ STI
+ .endm
+
+ .macro __build_clear_cli
+ CLI
+ .endm
+
+ .macro __build_clear_fpe
+ cfc1 a1, fcr31
+ li a2, ~(0x3f << 12)
+ and a2, a1
+ ctc1 a2, fcr31
+ STI
+ .endm
+
+ .macro __build_clear_ade
+ MFC0 t0, CP0_BADVADDR
+ PTR_S t0, PT_BVADDR(sp)
+ KMODE
+ .endm
+
+ .macro __BUILD_silent exception
+ .endm
+
+ /* Gas tries to parse the PRINT argument as a string containing
+ string escapes and emits bogus warnings if it believes to
+ recognize an unknown escape code. So make the arguments
+ start with an n and gas will believe \n is ok ... */
+ .macro __BUILD_verbose nexception
+ LONG_L a1, PT_EPC(sp)
+#if CONFIG_MIPS32
+ PRINT("Got \nexception at %08lx\012")
+#endif
+#if CONFIG_MIPS64
+ PRINT("Got \nexception at %016lx\012")
+#endif
+ .endm
+
+ .macro __BUILD_count exception
+ LONG_L t0,exception_count_\exception
+ LONG_ADDIU t0, 1
+ LONG_S t0,exception_count_\exception
+ .comm exception_count\exception, 8, 8
+ .endm
+
+ .macro __BUILD_HANDLER exception handler clear verbose ext
+ .align 5
+ NESTED(handle_\exception, PT_SIZE, sp)
+ .set noat
+ SAVE_ALL
+ FEXPORT(handle_\exception\ext)
+ __BUILD_clear_\clear
+ .set at
+ __BUILD_\verbose \exception
+ move a0, sp
+ jal do_\handler
+ j ret_from_exception
+ END(handle_\exception)
+ .endm
+
+ .macro BUILD_HANDLER exception handler clear verbose
+ __BUILD_HANDLER \exception \handler \clear \verbose _int
+ .endm
+
+ BUILD_HANDLER adel ade ade silent /* #4 */
+ BUILD_HANDLER ades ade ade silent /* #5 */
+ BUILD_HANDLER ibe be cli silent /* #6 */
+ BUILD_HANDLER dbe be cli silent /* #7 */
+ BUILD_HANDLER bp bp sti silent /* #9 */
+ BUILD_HANDLER ri ri sti silent /* #10 */
+ BUILD_HANDLER cpu cpu sti silent /* #11 */
+ BUILD_HANDLER ov ov sti silent /* #12 */
+ BUILD_HANDLER tr tr sti silent /* #13 */
+ BUILD_HANDLER fpe fpe fpe silent /* #15 */
+ BUILD_HANDLER mdmx mdmx sti silent /* #22 */
+ BUILD_HANDLER watch watch sti verbose /* #23 */
+ BUILD_HANDLER mcheck mcheck cli verbose /* #24 */
+ BUILD_HANDLER reserved reserved sti verbose /* others */
+
+#ifdef CONFIG_MIPS64
+/* A temporary overflow handler used by check_daddi(). */
+
+ __INIT
+
+ BUILD_HANDLER daddi_ov daddi_ov none silent /* #12 */
+#endif