root/include/asm-sparc/head.h

/* */

INCLUDED FROM

   1 /* $Id: head.h,v 1.19 1995/11/25 02:31:47 davem Exp $ */
   2 #ifndef __SPARC_HEAD_H
   3 #define __SPARC_HEAD_H
   4 
   5 #define KERNBASE        0xf0000000  /* First address the kernel will eventually be */
   6 #define LOAD_ADDR       0x4000      /* prom jumps to us here unless this is elf /boot */
   7 #define SUN4C_SEGSZ     (1 << 18)
   8 #define SRMMU_L1_KBASE_OFFSET ((KERNBASE>>24)<<2)  /* Used in boot remapping. */
   9 #define INTS_ENAB        0x01           /* entry.S uses this. */
  10 
  11 #define NCPUS            4              /* Architectual limit of sun4m. */
  12 
  13 #define SUN4_PROM_VECTOR 0xFFE81000     /* To safely die on a SUN4 */
  14 #define SUN4_PRINTF      0x84           /* Offset into SUN4_PROM_VECTOR */
  15 
  16 #define WRITE_PAUSE      nop; nop; nop; /* Have to do this after %wim/%psr chg */
  17 #define NOP_INSN         0x01000000     /* Used to patch sparc_save_state */
  18 
  19 /* Here are some trap goodies */
  20 
  21 /* Generic trap entry. */
  22 #define TRAP_ENTRY(type, label) \
  23         rd %psr, %l0; b label; rd %wim, %l3; nop;
  24 
  25 /* This is for traps we should NEVER get. */
  26 #define BAD_TRAP(num) \
  27         rd %psr, %l0; mov num, %l7; b bad_trap_handler; rd %wim, %l3;
  28 
  29 /* Notice that for the system calls we pull a trick.  We load up a
  30  * different pointer to the system call vector table in %l7, but call
  31  * the same generic system call low-level entry point.  The trap table
  32  * entry sequences are also HyperSparc pipeline friendly ;-)
  33  */
  34 
  35 /* Software trap for Linux system calls. */
  36 #define LINUX_SYSCALL_TRAP \
  37         sethi %hi(C_LABEL(sys_call_table)), %l7; \
  38         or %l7, %lo(C_LABEL(sys_call_table)), %l7; \
  39         b linux_sparc_syscall; \
  40         rd %psr, %l0;
  41 
  42 /* Software trap for SunOS4.1.x system calls. */
  43 #define SUNOS_SYSCALL_TRAP \
  44         sethi %hi(C_LABEL(sunos_sys_table)), %l7; \
  45         or %l7, %lo(C_LABEL(sunos_sys_table)), %l7; \
  46         b linux_sparc_syscall; \
  47         rd %psr, %l0;
  48 
  49 /* Software trap for Slowaris system calls. */
  50 #define SOLARIS_SYSCALL_TRAP \
  51         sethi %hi(C_LABEL(sys_call_table)), %l7; \
  52         or %l7, %lo(C_LABEL(sys_call_table)), %l7; \
  53         b linux_sparc_syscall; \
  54         rd %psr, %l0;
  55 
  56 /* Software trap for Sparc-netbsd system calls. */
  57 #define NETBSD_SYSCALL_TRAP \
  58         sethi %hi(C_LABEL(sys_call_table)), %l7; \
  59         or %l7, %lo(C_LABEL(sys_call_table)), %l7; \
  60         b linux_sparc_syscall; \
  61         rd %psr, %l0;
  62 
  63 /* The Get Condition Codes software trap for userland. */
  64 #define GETCC_TRAP \
  65         b getcc_trap_handler; mov %psr, %l0; nop; nop
  66 
  67 /* The Set Condition Codes software trap for userland. */
  68 #define SETCC_TRAP \
  69         b setcc_trap_handler; mov %psr, %l0; nop; nop
  70 
  71 /* This is for hard interrupts from level 1-14, 15 is non-maskable (nmi) and
  72  * gets handled with another macro.
  73  */
  74 #define TRAP_ENTRY_INTERRUPT(int_level) \
  75         mov int_level, %l7; rd %psr, %l0; b real_irq_entry; rd %wim, %l3;
  76 
  77 /* This is for software interrupts, which currently (atleast on the sun4c)
  78  * correspond to IRQ levels 1, 4, and 6.
  79  */
  80 #define TRAP_ENTRY_SOFTINT(int_level) \
  81         mov int_level, %l7; rd %psr, %l0; b soft_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 asyncronous 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; mov %psr, %l0; nop;
  92 
  93 /* Window overflows/underflows are special and we need to try and 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

/* */