include/asm-sparc/head.h

   1 #ifndef __SPARC_HEAD_H
   2 #define __SPARC_HEAD_H
   3
   4 #define KERNBASE        0xf0000000  /* First address the kernel will eventually be */
   5 #define LOAD_ADDR       0x4000      /* prom jumps to us here unless this is elf /boot */
   6 #define SUN4C_SEGSZ     (1 << 18)
   7 #define SRMMU_L1_KBASE_OFFSET ((KERNBASE>>24)<<2)  /* Used in boot remapping. */
   8 #define INTS_ENAB        0x01           /* entry.S uses this. */
   9
  10 #define SUN4_PROM_VECTOR 0xFFE81000     /* SUN4 PROM needs to be hardwired */
  11
  12 #define WRITE_PAUSE      nop; nop; nop; /* Have to do this after %wim/%psr chg */
  13 #define NOP_INSN         0x01000000     /* Used to patch sparc_save_state */
  14
  15 /* Here are some trap goodies */
  16
  17 /* Generic trap entry. */
  18 #define TRAP_ENTRY(type, label) \
  19         rd %psr, %l0; b label; rd %wim, %l3; nop;
  20
  21 /* Data/text faults. Defaults to sun4c version at boot time. */
  22 #define SPARC_TFAULT rd %psr, %l0; rd %wim, %l3; b sun4c_fault; mov 1, %l7;
  23 #define SPARC_DFAULT rd %psr, %l0; rd %wim, %l3; b sun4c_fault; mov 0, %l7;
  24 #define SRMMU_TFAULT rd %psr, %l0; rd %wim, %l3; b srmmu_fault; mov 1, %l7;
  25 #define SRMMU_DFAULT rd %psr, %l0; rd %wim, %l3; b srmmu_fault; mov 0, %l7;
  26
  27 /* This is for traps we should NEVER get. */
  28 #define BAD_TRAP(num) \
  29         rd %psr, %l0; mov num, %l7; b bad_trap_handler; rd %wim, %l3;
  30
  31 /* This is for traps when we want just skip the instruction which caused it */
  32 #define SKIP_TRAP(type, name) \
  33         jmpl %l2, %g0; rett %l2 + 4; nop; nop;
  34
  35 /* Notice that for the system calls we pull a trick.  We load up a
  36  * different pointer to the system call vector table in %l7, but call
  37  * the same generic system call low-level entry point.  The trap table
  38  * entry sequences are also HyperSparc pipeline friendly ;-)
  39  */
  40
  41 /* Software trap for Linux system calls. */
  42 #define LINUX_SYSCALL_TRAP \
  43         sethi %hi(sys_call_table), %l7; \
  44         or %l7, %lo(sys_call_table), %l7; \
  45         b linux_sparc_syscall; \
  46         rd %psr, %l0;
  47
  48 #define BREAKPOINT_TRAP \
  49         b breakpoint_trap; \
  50         rd %psr,%l0; \
  51         nop; \
  52         nop;
  53
  54 #ifdef CONFIG_KGDB
  55 #define KGDB_TRAP(num) \
  56         b kgdb_trap_low; \
  57         rd %psr,%l0; \
  58         nop; \
  59         nop;
  60 #else
  61 #define KGDB_TRAP(num) \
  62         BAD_TRAP(num)
  63 #endif
  64
  65 /* The Get Condition Codes software trap for userland. */
  66 #define GETCC_TRAP \
  67         b getcc_trap_handler; mov %psr, %l0; nop; nop;
  68
  69 /* The Set Condition Codes software trap for userland. */
  70 #define SETCC_TRAP \
  71         b setcc_trap_handler; mov %psr, %l0; nop; nop;
  72
  73 /* The Get PSR software trap for userland. */
  74 #define GETPSR_TRAP \
  75         mov %psr, %i0; jmp %l2; rett %l2 + 4; nop;
  76
  77 /* This is for hard interrupts from level 1-14, 15 is non-maskable (nmi) and
  78  * gets handled with another macro.
  79  */
  80 #define TRAP_ENTRY_INTERRUPT(int_level) \
  81         mov int_level, %l7; rd %psr, %l0; b real_irq_entry; rd %wim, %l3;
  82
  83 /* NMI's (Non Maskable Interrupts) are special, you can't keep them
  84  * from coming in, and basically if you get one, the shows over. ;(
  85  * On the sun4c they are usually asynchronous memory errors, on the
  86  * the sun4m they could be either due to mem errors or a software
  87  * initiated interrupt from the prom/kern on an SMP box saying "I
  88  * command you to do CPU tricks, read your mailbox for more info."
  89  */
  90 #define NMI_TRAP \
  91         rd %wim, %l3; b linux_trap_nmi_sun4c; mov %psr, %l0; nop;
  92
  93 /* Window overflows/underflows are special and we need to try to be as
  94  * efficient as possible here....
  95  */
  96 #define WINDOW_SPILL \
  97         rd %psr, %l0; rd %wim, %l3; b spill_window_entry; andcc %l0, PSR_PS, %g0;
  98
  99 #define WINDOW_FILL \
 100         rd %psr, %l0; rd %wim, %l3; b fill_window_entry; andcc %l0, PSR_PS, %g0;
 101
 102 #endif /* __SPARC_HEAD_H */