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

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef __SPARC_HEAD_H
   3#define __SPARC_HEAD_H
   4
   5#define KERNBASE        0xf0000000  /* First address the kernel will eventually be */
   6
   7#define WRITE_PAUSE      nop; nop; nop; /* Have to do this after %wim/%psr chg */
   8
   9/* Here are some trap goodies */
  10
  11/* Generic trap entry. */
  12#define TRAP_ENTRY(type, label) \
  13        rd %psr, %l0; b label; rd %wim, %l3; nop;
  14
  15/* Data/text faults */
  16#define SRMMU_TFAULT rd %psr, %l0; rd %wim, %l3; b srmmu_fault; mov 1, %l7;
  17#define SRMMU_DFAULT rd %psr, %l0; rd %wim, %l3; b srmmu_fault; mov 0, %l7;
  18
  19/* This is for traps we should NEVER get. */
  20#define BAD_TRAP(num) \
  21        rd %psr, %l0; mov num, %l7; b bad_trap_handler; rd %wim, %l3;
  22
  23/* This is for traps when we want just skip the instruction which caused it */
  24#define SKIP_TRAP(type, name) \
  25        jmpl %l2, %g0; rett %l2 + 4; nop; nop;
  26
  27/* Notice that for the system calls we pull a trick.  We load up a
  28 * different pointer to the system call vector table in %l7, but call
  29 * the same generic system call low-level entry point.  The trap table
  30 * entry sequences are also HyperSparc pipeline friendly ;-)
  31 */
  32
  33/* Software trap for Linux system calls. */
  34#define LINUX_SYSCALL_TRAP \
  35        sethi %hi(sys_call_table), %l7; \
  36        or %l7, %lo(sys_call_table), %l7; \
  37        b linux_sparc_syscall; \
  38        rd %psr, %l0;
  39
  40#define BREAKPOINT_TRAP \
  41        b breakpoint_trap; \
  42        rd %psr,%l0; \
  43        nop; \
  44        nop;
  45
  46#ifdef CONFIG_KGDB
  47#define KGDB_TRAP(num)                  \
  48        mov num, %l7;                   \
  49        b kgdb_trap_low;                \
  50        rd %psr,%l0;                    \
  51        nop;
  52#else
  53#define KGDB_TRAP(num) \
  54        BAD_TRAP(num)
  55#endif
  56
  57/* The Get Condition Codes software trap for userland. */
  58#define GETCC_TRAP \
  59        b getcc_trap_handler; rd %psr, %l0; nop; nop;
  60
  61/* The Set Condition Codes software trap for userland. */
  62#define SETCC_TRAP \
  63        b setcc_trap_handler; rd %psr, %l0; nop; nop;
  64
  65/* The Get PSR software trap for userland. */
  66#define GETPSR_TRAP \
  67        rd %psr, %i0; jmp %l2; rett %l2 + 4; nop;
  68
  69/* This is for hard interrupts from level 1-14, 15 is non-maskable (nmi) and
  70 * gets handled with another macro.
  71 */
  72#define TRAP_ENTRY_INTERRUPT(int_level) \
  73        mov int_level, %l7; rd %psr, %l0; b real_irq_entry; rd %wim, %l3;
  74
  75/* Window overflows/underflows are special and we need to try to be as
  76 * efficient as possible here....
  77 */
  78#define WINDOW_SPILL \
  79        rd %psr, %l0; rd %wim, %l3; b spill_window_entry; andcc %l0, PSR_PS, %g0;
  80
  81#define WINDOW_FILL \
  82        rd %psr, %l0; rd %wim, %l3; b fill_window_entry; andcc %l0, PSR_PS, %g0;
  83
  84#endif /* __SPARC_HEAD_H */
  85