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linux-stable/arch/sparc64/kernel/ttable.S
David S. Miller 56fb4df6da [SPARC64]: Elminate all usage of hard-coded trap globals. 
UltraSPARC has special sets of global registers which are switched to
for certain trap types.  There is one set for MMU related traps, one
set of Interrupt Vector processing, and another set (called the
Alternate globals) for all other trap types.

For what seems like forever we've hard coded the values in some of
these trap registers.  Some examples include:

1) Interrupt Vector global %g6 holds current processors interrupt
   work struct where received interrupts are managed for IRQ handler
   dispatch.

2) MMU global %g7 holds the base of the page tables of the currently
   active address space.

3) Alternate global %g6 held the current_thread_info() value.

Such hardcoding has resulted in some serious issues in many areas.
There are some code sequences where having another register available
would help clean up the implementation.  Taking traps such as
cross-calls from the OBP firmware requires some trick code sequences
wherein we have to save away and restore all of the special sets of
global registers when we enter/exit OBP.

We were also using the IMMU TSB register on SMP to hold the per-cpu
area base address, which doesn't work any longer now that we actually
use the TSB facility of the cpu.

The implementation is pretty straight forward.  One tricky bit is
getting the current processor ID as that is different on different cpu
variants.  We use a stub with a fancy calling convention which we
patch at boot time.  The calling convention is that the stub is
branched to and the (PC - 4) to return to is in register %g1.  The cpu
number is left in %g6.  This stub can be invoked by using the
__GET_CPUID macro.

We use an array of per-cpu trap state to store the current thread and
physical address of the current address space's page tables.  The
TRAP_LOAD_THREAD_REG loads %g6 with the current thread from this
table, it uses __GET_CPUID and also clobbers %g1.

TRAP_LOAD_IRQ_WORK is used by the interrupt vector processing to load
the current processor's IRQ software state into %g6.  It also uses
__GET_CPUID and clobbers %g1.

Finally, TRAP_LOAD_PGD_PHYS loads the physical address base of the
current address space's page tables into %g7, it clobbers %g1 and uses
__GET_CPUID.

Many refinements are possible, as well as some tuning, with this stuff
in place.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 01:11:16 -08:00

285 lines
11 KiB
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/* $Id: ttable.S,v 1.38 2002/02/09 19:49:30 davem Exp $
* ttable.S: Sparc V9 Trap Table(s) with SpitFire/Cheetah extensions.
*
* Copyright (C) 1996, 2001 David S. Miller (davem@caip.rutgers.edu)
*/
#include <linux/config.h>
.globl sparc64_ttable_tl0, sparc64_ttable_tl1
.globl tl0_icpe, tl1_icpe
.globl tl0_dcpe, tl1_dcpe
.globl tl0_fecc, tl1_fecc
.globl tl0_cee, tl1_cee
.globl tl0_iae, tl1_iae
.globl tl0_dae, tl1_dae
sparc64_ttable_tl0:
tl0_resv000: BOOT_KERNEL BTRAP(0x1) BTRAP(0x2) BTRAP(0x3)
tl0_resv004: BTRAP(0x4) BTRAP(0x5) BTRAP(0x6) BTRAP(0x7)
tl0_iax: membar #Sync
TRAP_NOSAVE_7INSNS(__spitfire_insn_access_exception)
tl0_resv009: BTRAP(0x9)
tl0_iae: membar #Sync
TRAP_NOSAVE_7INSNS(__spitfire_access_error)
tl0_resv00b: BTRAP(0xb) BTRAP(0xc) BTRAP(0xd) BTRAP(0xe) BTRAP(0xf)
tl0_ill: membar #Sync
TRAP_7INSNS(do_illegal_instruction)
tl0_privop: TRAP(do_privop)
tl0_resv012: BTRAP(0x12) BTRAP(0x13) BTRAP(0x14) BTRAP(0x15) BTRAP(0x16) BTRAP(0x17)
tl0_resv018: BTRAP(0x18) BTRAP(0x19) BTRAP(0x1a) BTRAP(0x1b) BTRAP(0x1c) BTRAP(0x1d)
tl0_resv01e: BTRAP(0x1e) BTRAP(0x1f)
tl0_fpdis: TRAP_NOSAVE(do_fpdis)
tl0_fpieee: TRAP_SAVEFPU(do_fpieee)
tl0_fpother: TRAP_NOSAVE(do_fpother_check_fitos)
tl0_tof: TRAP(do_tof)
tl0_cwin: CLEAN_WINDOW
tl0_div0: TRAP(do_div0)
tl0_resv029: BTRAP(0x29) BTRAP(0x2a) BTRAP(0x2b) BTRAP(0x2c) BTRAP(0x2d) BTRAP(0x2e)
tl0_resv02f: BTRAP(0x2f)
tl0_dax: TRAP_NOSAVE(__spitfire_data_access_exception)
tl0_resv031: BTRAP(0x31)
tl0_dae: membar #Sync
TRAP_NOSAVE_7INSNS(__spitfire_access_error)
tl0_resv033: BTRAP(0x33)
tl0_mna: TRAP_NOSAVE(do_mna)
tl0_lddfmna: TRAP_NOSAVE(do_lddfmna)
tl0_stdfmna: TRAP_NOSAVE(do_stdfmna)
tl0_privact: TRAP_NOSAVE(__do_privact)
tl0_resv038: BTRAP(0x38) BTRAP(0x39) BTRAP(0x3a) BTRAP(0x3b) BTRAP(0x3c) BTRAP(0x3d)
tl0_resv03e: BTRAP(0x3e) BTRAP(0x3f) BTRAP(0x40)
#ifdef CONFIG_SMP
tl0_irq1: TRAP_IRQ(smp_call_function_client, 1)
tl0_irq2: TRAP_IRQ(smp_receive_signal_client, 2)
tl0_irq3: TRAP_IRQ(smp_penguin_jailcell, 3)
#else
tl0_irq1: BTRAP(0x41)
tl0_irq2: BTRAP(0x42)
tl0_irq3: BTRAP(0x43)
#endif
tl0_irq4: TRAP_IRQ(handler_irq, 4)
tl0_irq5: TRAP_IRQ(handler_irq, 5) TRAP_IRQ(handler_irq, 6)
tl0_irq7: TRAP_IRQ(handler_irq, 7) TRAP_IRQ(handler_irq, 8)
tl0_irq9: TRAP_IRQ(handler_irq, 9) TRAP_IRQ(handler_irq, 10)
tl0_irq11: TRAP_IRQ(handler_irq, 11) TRAP_IRQ(handler_irq, 12)
tl0_irq13: TRAP_IRQ(handler_irq, 13)
#ifndef CONFIG_SMP
tl0_irq14: TRAP_IRQ(handler_irq, 14)
#else
tl0_irq14: TICK_SMP_IRQ
#endif
tl0_irq15: TRAP_IRQ(handler_irq, 15)
tl0_resv050: BTRAP(0x50) BTRAP(0x51) BTRAP(0x52) BTRAP(0x53) BTRAP(0x54) BTRAP(0x55)
tl0_resv056: BTRAP(0x56) BTRAP(0x57) BTRAP(0x58) BTRAP(0x59) BTRAP(0x5a) BTRAP(0x5b)
tl0_resv05c: BTRAP(0x5c) BTRAP(0x5d) BTRAP(0x5e) BTRAP(0x5f)
tl0_ivec: TRAP_IVEC
tl0_paw: TRAP(do_paw)
tl0_vaw: TRAP(do_vaw)
tl0_cee: membar #Sync
TRAP_NOSAVE_7INSNS(__spitfire_cee_trap)
tl0_iamiss:
#include "itlb_miss.S"
tl0_damiss:
#include "dtlb_miss.S"
tl0_daprot:
#include "dtlb_prot.S"
tl0_fecc: BTRAP(0x70) /* Fast-ECC on Cheetah */
tl0_dcpe: BTRAP(0x71) /* D-cache Parity Error on Cheetah+ */
tl0_icpe: BTRAP(0x72) /* I-cache Parity Error on Cheetah+ */
tl0_resv073: BTRAP(0x73) BTRAP(0x74) BTRAP(0x75)
tl0_resv076: BTRAP(0x76) BTRAP(0x77) BTRAP(0x78) BTRAP(0x79) BTRAP(0x7a) BTRAP(0x7b)
tl0_resv07c: BTRAP(0x7c) BTRAP(0x7d) BTRAP(0x7e) BTRAP(0x7f)
tl0_s0n: SPILL_0_NORMAL
tl0_s1n: SPILL_1_NORMAL
tl0_s2n: SPILL_2_NORMAL
tl0_s3n: SPILL_3_NORMAL
tl0_s4n: SPILL_4_NORMAL
tl0_s5n: SPILL_5_NORMAL
tl0_s6n: SPILL_6_NORMAL
tl0_s7n: SPILL_7_NORMAL
tl0_s0o: SPILL_0_OTHER
tl0_s1o: SPILL_1_OTHER
tl0_s2o: SPILL_2_OTHER
tl0_s3o: SPILL_3_OTHER
tl0_s4o: SPILL_4_OTHER
tl0_s5o: SPILL_5_OTHER
tl0_s6o: SPILL_6_OTHER
tl0_s7o: SPILL_7_OTHER
tl0_f0n: FILL_0_NORMAL
tl0_f1n: FILL_1_NORMAL
tl0_f2n: FILL_2_NORMAL
tl0_f3n: FILL_3_NORMAL
tl0_f4n: FILL_4_NORMAL
tl0_f5n: FILL_5_NORMAL
tl0_f6n: FILL_6_NORMAL
tl0_f7n: FILL_7_NORMAL
tl0_f0o: FILL_0_OTHER
tl0_f1o: FILL_1_OTHER
tl0_f2o: FILL_2_OTHER
tl0_f3o: FILL_3_OTHER
tl0_f4o: FILL_4_OTHER
tl0_f5o: FILL_5_OTHER
tl0_f6o: FILL_6_OTHER
tl0_f7o: FILL_7_OTHER
tl0_sunos: SUNOS_SYSCALL_TRAP
tl0_bkpt: BREAKPOINT_TRAP
tl0_divz: TRAP(do_div0)
tl0_flushw: FLUSH_WINDOW_TRAP
tl0_resv104: BTRAP(0x104) BTRAP(0x105) BTRAP(0x106) BTRAP(0x107)
.globl tl0_solaris
tl0_solaris: SOLARIS_SYSCALL_TRAP
tl0_resv109: BTRAP(0x109)
tl0_resv10a: BTRAP(0x10a) BTRAP(0x10b) BTRAP(0x10c) BTRAP(0x10d) BTRAP(0x10e)
tl0_resv10f: BTRAP(0x10f)
tl0_linux32: LINUX_32BIT_SYSCALL_TRAP
tl0_oldlinux64: LINUX_64BIT_SYSCALL_TRAP
tl0_resv112: TRAP_UTRAP(UT_TRAP_INSTRUCTION_18,0x112) TRAP_UTRAP(UT_TRAP_INSTRUCTION_19,0x113)
tl0_resv114: TRAP_UTRAP(UT_TRAP_INSTRUCTION_20,0x114) TRAP_UTRAP(UT_TRAP_INSTRUCTION_21,0x115)
tl0_resv116: TRAP_UTRAP(UT_TRAP_INSTRUCTION_22,0x116) TRAP_UTRAP(UT_TRAP_INSTRUCTION_23,0x117)
tl0_resv118: TRAP_UTRAP(UT_TRAP_INSTRUCTION_24,0x118) TRAP_UTRAP(UT_TRAP_INSTRUCTION_25,0x119)
tl0_resv11a: TRAP_UTRAP(UT_TRAP_INSTRUCTION_26,0x11a) TRAP_UTRAP(UT_TRAP_INSTRUCTION_27,0x11b)
tl0_resv11c: TRAP_UTRAP(UT_TRAP_INSTRUCTION_28,0x11c) TRAP_UTRAP(UT_TRAP_INSTRUCTION_29,0x11d)
tl0_resv11e: TRAP_UTRAP(UT_TRAP_INSTRUCTION_30,0x11e) TRAP_UTRAP(UT_TRAP_INSTRUCTION_31,0x11f)
tl0_getcc: GETCC_TRAP
tl0_setcc: SETCC_TRAP
tl0_getpsr: TRAP(do_getpsr)
tl0_resv123: BTRAP(0x123) BTRAP(0x124) BTRAP(0x125) BTRAP(0x126)
tl0_solindir: INDIRECT_SOLARIS_SYSCALL(156)
tl0_resv128: BTRAP(0x128) BTRAP(0x129) BTRAP(0x12a) BTRAP(0x12b) BTRAP(0x12c)
tl0_resv12d: BTRAP(0x12d) BTRAP(0x12e) BTRAP(0x12f) BTRAP(0x130) BTRAP(0x131)
tl0_resv132: BTRAP(0x132) BTRAP(0x133) BTRAP(0x134) BTRAP(0x135) BTRAP(0x136)
tl0_resv137: BTRAP(0x137) BTRAP(0x138) BTRAP(0x139) BTRAP(0x13a) BTRAP(0x13b)
tl0_resv13c: BTRAP(0x13c) BTRAP(0x13d) BTRAP(0x13e) BTRAP(0x13f) BTRAP(0x140)
tl0_resv141: BTRAP(0x141) BTRAP(0x142) BTRAP(0x143) BTRAP(0x144) BTRAP(0x145)
tl0_resv146: BTRAP(0x146) BTRAP(0x147) BTRAP(0x148) BTRAP(0x149) BTRAP(0x14a)
tl0_resv14b: BTRAP(0x14b) BTRAP(0x14c) BTRAP(0x14d) BTRAP(0x14e) BTRAP(0x14f)
tl0_resv150: BTRAP(0x150) BTRAP(0x151) BTRAP(0x152) BTRAP(0x153) BTRAP(0x154)
tl0_resv155: BTRAP(0x155) BTRAP(0x156) BTRAP(0x157) BTRAP(0x158) BTRAP(0x159)
tl0_resv15a: BTRAP(0x15a) BTRAP(0x15b) BTRAP(0x15c) BTRAP(0x15d) BTRAP(0x15e)
tl0_resv15f: BTRAP(0x15f) BTRAP(0x160) BTRAP(0x161) BTRAP(0x162) BTRAP(0x163)
tl0_resv164: BTRAP(0x164) BTRAP(0x165) BTRAP(0x166) BTRAP(0x167) BTRAP(0x168)
tl0_resv169: BTRAP(0x169) BTRAP(0x16a) BTRAP(0x16b) BTRAP(0x16c)
tl0_linux64: LINUX_64BIT_SYSCALL_TRAP
tl0_gsctx: TRAP(sparc64_get_context) TRAP(sparc64_set_context)
tl0_resv170: KPROBES_TRAP(0x170) KPROBES_TRAP(0x171) BTRAP(0x172)
tl0_resv173: BTRAP(0x173) BTRAP(0x174) BTRAP(0x175) BTRAP(0x176) BTRAP(0x177)
tl0_resv178: BTRAP(0x178) BTRAP(0x179) BTRAP(0x17a) BTRAP(0x17b) BTRAP(0x17c)
tl0_resv17d: BTRAP(0x17d) BTRAP(0x17e) BTRAP(0x17f)
#define BTRAPS(x) BTRAP(x) BTRAP(x+1) BTRAP(x+2) BTRAP(x+3) BTRAP(x+4) BTRAP(x+5) BTRAP(x+6) BTRAP(x+7)
tl0_resv180: BTRAPS(0x180) BTRAPS(0x188)
tl0_resv190: BTRAPS(0x190) BTRAPS(0x198)
tl0_resv1a0: BTRAPS(0x1a0) BTRAPS(0x1a8)
tl0_resv1b0: BTRAPS(0x1b0) BTRAPS(0x1b8)
tl0_resv1c0: BTRAPS(0x1c0) BTRAPS(0x1c8)
tl0_resv1d0: BTRAPS(0x1d0) BTRAPS(0x1d8)
tl0_resv1e0: BTRAPS(0x1e0) BTRAPS(0x1e8)
tl0_resv1f0: BTRAPS(0x1f0) BTRAPS(0x1f8)
sparc64_ttable_tl1:
tl1_resv000: BOOT_KERNEL BTRAPTL1(0x1) BTRAPTL1(0x2) BTRAPTL1(0x3)
tl1_resv004: BTRAPTL1(0x4) BTRAPTL1(0x5) BTRAPTL1(0x6) BTRAPTL1(0x7)
tl1_iax: TRAP_NOSAVE(__spitfire_insn_access_exception_tl1)
tl1_resv009: BTRAPTL1(0x9)
tl1_iae: membar #Sync
TRAP_NOSAVE_7INSNS(__spitfire_access_error)
tl1_resv00b: BTRAPTL1(0xb) BTRAPTL1(0xc) BTRAPTL1(0xd) BTRAPTL1(0xe) BTRAPTL1(0xf)
tl1_ill: TRAPTL1(do_ill_tl1)
tl1_privop: BTRAPTL1(0x11)
tl1_resv012: BTRAPTL1(0x12) BTRAPTL1(0x13) BTRAPTL1(0x14) BTRAPTL1(0x15)
tl1_resv016: BTRAPTL1(0x16) BTRAPTL1(0x17) BTRAPTL1(0x18) BTRAPTL1(0x19)
tl1_resv01a: BTRAPTL1(0x1a) BTRAPTL1(0x1b) BTRAPTL1(0x1c) BTRAPTL1(0x1d)
tl1_resv01e: BTRAPTL1(0x1e) BTRAPTL1(0x1f)
tl1_fpdis: TRAP_NOSAVE(do_fpdis)
tl1_fpieee: TRAPTL1(do_fpieee_tl1)
tl1_fpother: TRAPTL1(do_fpother_tl1)
tl1_tof: TRAPTL1(do_tof_tl1)
tl1_cwin: CLEAN_WINDOW
tl1_div0: TRAPTL1(do_div0_tl1)
tl1_resv029: BTRAPTL1(0x29) BTRAPTL1(0x2a) BTRAPTL1(0x2b) BTRAPTL1(0x2c)
tl1_resv02d: BTRAPTL1(0x2d) BTRAPTL1(0x2e) BTRAPTL1(0x2f)
tl1_dax: TRAP_NOSAVE(__spitfire_data_access_exception_tl1)
tl1_resv031: BTRAPTL1(0x31)
tl1_dae: membar #Sync
TRAP_NOSAVE_7INSNS(__spitfire_access_error)
tl1_resv033: BTRAPTL1(0x33)
tl1_mna: TRAP_NOSAVE(do_mna)
tl1_lddfmna: TRAPTL1(do_lddfmna_tl1)
tl1_stdfmna: TRAPTL1(do_stdfmna_tl1)
tl1_privact: BTRAPTL1(0x37)
tl1_resv038: BTRAPTL1(0x38) BTRAPTL1(0x39) BTRAPTL1(0x3a) BTRAPTL1(0x3b)
tl1_resv03c: BTRAPTL1(0x3c) BTRAPTL1(0x3d) BTRAPTL1(0x3e) BTRAPTL1(0x3f)
tl1_resv040: BTRAPTL1(0x40)
tl1_irq1: TRAP_IRQ(do_irq_tl1, 1) TRAP_IRQ(do_irq_tl1, 2) TRAP_IRQ(do_irq_tl1, 3)
tl1_irq4: TRAP_IRQ(do_irq_tl1, 4) TRAP_IRQ(do_irq_tl1, 5) TRAP_IRQ(do_irq_tl1, 6)
tl1_irq7: TRAP_IRQ(do_irq_tl1, 7) TRAP_IRQ(do_irq_tl1, 8) TRAP_IRQ(do_irq_tl1, 9)
tl1_irq10: TRAP_IRQ(do_irq_tl1, 10) TRAP_IRQ(do_irq_tl1, 11)
tl1_irq12: TRAP_IRQ(do_irq_tl1, 12) TRAP_IRQ(do_irq_tl1, 13)
tl1_irq14: TRAP_IRQ(do_irq_tl1, 14) TRAP_IRQ(do_irq_tl1, 15)
tl1_resv050: BTRAPTL1(0x50) BTRAPTL1(0x51) BTRAPTL1(0x52) BTRAPTL1(0x53)
tl1_resv054: BTRAPTL1(0x54) BTRAPTL1(0x55) BTRAPTL1(0x56) BTRAPTL1(0x57)
tl1_resv058: BTRAPTL1(0x58) BTRAPTL1(0x59) BTRAPTL1(0x5a) BTRAPTL1(0x5b)
tl1_resv05c: BTRAPTL1(0x5c) BTRAPTL1(0x5d) BTRAPTL1(0x5e) BTRAPTL1(0x5f)
tl1_ivec: TRAP_IVEC
tl1_paw: TRAPTL1(do_paw_tl1)
tl1_vaw: TRAPTL1(do_vaw_tl1)
/* The grotty trick to save %g1 into current->thread.cee_stuff
* is because when we take this trap we could be interrupting
* trap code already using the trap alternate global registers.
*
* We cross our fingers and pray that this store/load does
* not cause yet another CEE trap.
*/
tl1_cee: membar #Sync
stx %g1, [%g6 + TI_CEE_STUFF]
ldxa [%g0] ASI_AFSR, %g1
membar #Sync
stxa %g1, [%g0] ASI_AFSR
membar #Sync
ldx [%g6 + TI_CEE_STUFF], %g1
retry
tl1_iamiss: BTRAPTL1(0x64) BTRAPTL1(0x65) BTRAPTL1(0x66) BTRAPTL1(0x67)
tl1_damiss:
#include "dtlb_miss.S"
tl1_daprot:
#include "dtlb_prot.S"
tl1_fecc: BTRAPTL1(0x70) /* Fast-ECC on Cheetah */
tl1_dcpe: BTRAPTL1(0x71) /* D-cache Parity Error on Cheetah+ */
tl1_icpe: BTRAPTL1(0x72) /* I-cache Parity Error on Cheetah+ */
tl1_resv073: BTRAPTL1(0x73)
tl1_resv074: BTRAPTL1(0x74) BTRAPTL1(0x75) BTRAPTL1(0x76) BTRAPTL1(0x77)
tl1_resv078: BTRAPTL1(0x78) BTRAPTL1(0x79) BTRAPTL1(0x7a) BTRAPTL1(0x7b)
tl1_resv07c: BTRAPTL1(0x7c) BTRAPTL1(0x7d) BTRAPTL1(0x7e) BTRAPTL1(0x7f)
tl1_s0n: SPILL_0_NORMAL
tl1_s1n: SPILL_1_NORMAL
tl1_s2n: SPILL_2_NORMAL
tl1_s3n: SPILL_3_NORMAL
tl1_s4n: SPILL_4_NORMAL
tl1_s5n: SPILL_5_NORMAL
tl1_s6n: SPILL_6_NORMAL
tl1_s7n: SPILL_7_NORMAL
tl1_s0o: SPILL_0_OTHER
tl1_s1o: SPILL_1_OTHER
tl1_s2o: SPILL_2_OTHER
tl1_s3o: SPILL_3_OTHER
tl1_s4o: SPILL_4_OTHER
tl1_s5o: SPILL_5_OTHER
tl1_s6o: SPILL_6_OTHER
tl1_s7o: SPILL_7_OTHER
tl1_f0n: FILL_0_NORMAL
tl1_f1n: FILL_1_NORMAL
tl1_f2n: FILL_2_NORMAL
tl1_f3n: FILL_3_NORMAL
tl1_f4n: FILL_4_NORMAL
tl1_f5n: FILL_5_NORMAL
tl1_f6n: FILL_6_NORMAL
tl1_f7n: FILL_7_NORMAL
tl1_f0o: FILL_0_OTHER
tl1_f1o: FILL_1_OTHER
tl1_f2o: FILL_2_OTHER
tl1_f3o: FILL_3_OTHER
tl1_f4o: FILL_4_OTHER
tl1_f5o: FILL_5_OTHER
tl1_f6o: FILL_6_OTHER
tl1_f7o: FILL_7_OTHER
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