LXR linux/arch/sparc/include/asm/head

   1#ifndef __SPARC_HEAD_H
   2#define __SPARC_HEAD_H
   3
   4#define KERNBASE        0xf0000000  /* First address the kernel will eventually be */
   5
   6#define WRITE_PAUSE      nop; nop; nop; /* Have to do this after %wim/%psr chg */
   7
   8/* Here are some trap goodies */
   9
  10/* Generic trap entry. */
  11#define TRAP_ENTRY(type, label) \
  12        rd %psr, %l0; b label; rd %wim, %l3; nop;
  13
  14/* Data/text faults */
  15#define SRMMU_TFAULT rd %psr, %l0; rd %wim, %l3; b srmmu_fault; mov 1, %l7;
  16#define SRMMU_DFAULT rd %psr, %l0; rd %wim, %l3; b srmmu_fault; mov 0, %l7;
  17
  18/* This is for traps we should NEVER get. */
  19#define BAD_TRAP(num) \
  20        rd %psr, %l0; mov num, %l7; b bad_trap_handler; rd %wim, %l3;
  21
  22/* This is for traps when we want just skip the instruction which caused it */
  23#define SKIP_TRAP(type, name) \
  24        jmpl %l2, %g0; rett %l2 + 4; nop; nop;
  25
  26/* Notice that for the system calls we pull a trick.  We load up a
  27 * different pointer to the system call vector table in %l7, but call
  28 * the same generic system call low-level entry point.  The trap table
  29 * entry sequences are also HyperSparc pipeline friendly ;-)
  30 */
  31
  32/* Software trap for Linux system calls. */
  33#define LINUX_SYSCALL_TRAP \
  34        sethi %hi(sys_call_table), %l7; \
  35        or %l7, %lo(sys_call_table), %l7; \
  36        b linux_sparc_syscall; \
  37        rd %psr, %l0;
  38
  39#define BREAKPOINT_TRAP \
  40        b breakpoint_trap; \
  41        rd %psr,%l0; \
  42        nop; \
  43        nop;
  44
  45#ifdef CONFIG_KGDB
  46#define KGDB_TRAP(num)                  \
  47        mov num, %l7;                   \
  48        b kgdb_trap_low;                \
  49        rd %psr,%l0;                    \
  50        nop;
  51#else
  52#define KGDB_TRAP(num) \
  53        BAD_TRAP(num)
  54#endif
  55
  56/* The Get Condition Codes software trap for userland. */
  57#define GETCC_TRAP \
  58        b getcc_trap_handler; rd %psr, %l0; nop; nop;
  59
  60/* The Set Condition Codes software trap for userland. */
  61#define SETCC_TRAP \
  62        b setcc_trap_handler; rd %psr, %l0; nop; nop;
  63
  64/* The Get PSR software trap for userland. */
  65#define GETPSR_TRAP \
  66        rd %psr, %i0; jmp %l2; rett %l2 + 4; nop;
  67
  68/* This is for hard interrupts from level 1-14, 15 is non-maskable (nmi) and
  69 * gets handled with another macro.
  70 */
  71#define TRAP_ENTRY_INTERRUPT(int_level) \
  72        mov int_level, %l7; rd %psr, %l0; b real_irq_entry; rd %wim, %l3;
  73
  74/* Window overflows/underflows are special and we need to try to be as
  75 * efficient as possible here....
  76 */
  77#define WINDOW_SPILL \
  78        rd %psr, %l0; rd %wim, %l3; b spill_window_entry; andcc %l0, PSR_PS, %g0;
  79
  80#define WINDOW_FILL \
  81        rd %psr, %l0; rd %wim, %l3; b fill_window_entry; andcc %l0, PSR_PS, %g0;
  82
  83#endif /* __SPARC_HEAD_H */
  84