389 lines
7.1 KiB
C
389 lines
7.1 KiB
C
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/* Stand-alone library for SPARClite
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*
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* Copyright (c) 1995 Cygnus Support
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*
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* The authors hereby grant permission to use, copy, modify, distribute,
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* and license this software and its documentation for any purpose, provided
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* that existing copyright notices are retained in all copies and that this
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* notice is included verbatim in any distributions. No written agreement,
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* license, or royalty fee is required for any of the authorized uses.
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* Modifications to this software may be copyrighted by their authors
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* and need not follow the licensing terms described here, provided that
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* the new terms are clearly indicated on the first page of each file where
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* they apply.
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*/
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#include "sparclite.h"
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#include "asm.h"
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/* LED blinking pattern can be changed by modifying __led_algorithm. */
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enum ledtype
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{
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led_marching, /* marching pattern, only one led on at a time */
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led_random, /* pseudo-random pattern */
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led_blinking, /* all leds blink on and off */
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led_none /* leds off all the time */
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};
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enum ledtype __led_algorithm = led_marching;
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/* Pointer to hook for outbyte, set by stub's exception handler. */
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void (*__outbyte_hook) (int c);
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#ifdef SL931
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#define SDTR_BASE 0x200
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#define SDTR_ASI 1
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#define SDTR_SHIFT 0
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#else
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#define SDTR_BASE 0x10000000
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#define SDTR_ASI 4
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#define SDTR_SHIFT 16
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#endif
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#define get_uart_status(PORT) \
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(read_asi (SDTR_ASI, SDTR_BASE + 0x24 + (PORT) * 0x10) >> SDTR_SHIFT)
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#define xmt_char(PORT, C) \
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write_asi (SDTR_ASI, SDTR_BASE + 0x20 + (PORT) * 0x10, (C) << SDTR_SHIFT)
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#define rcv_char(PORT) \
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(read_asi (SDTR_ASI, SDTR_BASE + 0x20 + (PORT) * 0x10) >> SDTR_SHIFT)
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void putDebugChar();
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#if 0
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void
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set_uart (cmd)
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int cmd;
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{
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write_asi (SDTR_ASI, SDTR_BASE + 0x24, cmd << SDTR_SHIFT);
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}
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void
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set_timer_3 (val)
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int val;
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{
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write_asi (SDTR_ASI, SDTR_BASE + 0x78, val << SDTR_SHIFT);
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}
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#endif
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asm("
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.text
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.align 4
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! Register window overflow handler. Come here when save would move us
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! into the invalid window. This routine runs with traps disabled, and
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! must be careful not to touch the condition codes, as PSR is never
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! restored.
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!
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! We are called with %l0 = wim, %l1 = pc, %l2 = npc
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.globl " STRINGSYM(win_ovf) "
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" STRINGSYM(win_ovf) ":
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mov %g1, %l3 ! Save g1, we use it to hold the wim
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srl %l0, 1, %g1 ! Rotate wim right
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sll %l0, __WINSIZE-1, %l0
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or %l0, %g1, %g1
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save %g0, %g0, %g0 ! Slip into next window
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mov %g1, %wim ! Install the new wim
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std %l0, [%sp + 0 * 4] ! save L & I registers
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std %l2, [%sp + 2 * 4]
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std %l4, [%sp + 4 * 4]
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std %l6, [%sp + 6 * 4]
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std %i0, [%sp + 8 * 4]
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std %i2, [%sp + 10 * 4]
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std %i4, [%sp + 12 * 4]
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std %i6, [%sp + 14 * 4]
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restore ! Go back to trap window.
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mov %l3, %g1 ! Restore %g1
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jmpl %l1, %g0
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rett %l2
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! Register window underflow handler. Come here when restore would move us
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! into the invalid window. This routine runs with traps disabled, and
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! must be careful not to touch the condition codes, as PSR is never
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! restored.
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!
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! We are called with %l0 = wim, %l1 = pc, %l2 = npc
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.globl " STRINGSYM(win_unf) "
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" STRINGSYM(win_unf) ":
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sll %l0, 1, %l3 ! Rotate wim left
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srl %l0, __WINSIZE-1, %l0
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or %l0, %l3, %l0
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mov %l0, %wim ! Install the new wim
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restore ! User's window
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restore ! His caller's window
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ldd [%sp + 0 * 4], %l0 ! restore L & I registers
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ldd [%sp + 2 * 4], %l2
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ldd [%sp + 4 * 4], %l4
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ldd [%sp + 6 * 4], %l6
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ldd [%sp + 8 * 4], %i0
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ldd [%sp + 10 * 4], %i2
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ldd [%sp + 12 * 4], %i4
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ldd [%sp + 14 * 4], %i6
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save %g0, %g0, %g0 ! Back to trap window
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save %g0, %g0, %g0
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jmpl %l1, %g0
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rett %l2
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! Read the TBR.
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.globl " STRINGSYM(rdtbr) "
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" STRINGSYM(rdtbr) ":
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retl
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mov %tbr, %o0
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");
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extern unsigned long rdtbr();
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void
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die(val)
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int val;
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{
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static unsigned char *leds = (unsigned char *)0x02000003;
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*leds = val;
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while (1) ;
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}
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/* Each entry in the trap vector occupies four words. */
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struct trap_entry
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{
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unsigned sethi_filler:10;
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unsigned sethi_imm22:22;
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unsigned jmpl_filler:19;
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unsigned jmpl_simm13:13;
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unsigned long filler[2];
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};
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extern struct trap_entry fltr_proto;
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asm ("
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.data
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.globl " STRINGSYM(fltr_proto) "
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.align 4
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" STRINGSYM(fltr_proto) ": ! First level trap routine prototype
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sethi 0, %l0
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jmpl 0+%l0, %g0
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nop
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nop
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.text
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.align 4
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");
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/* Setup trap TT to go to ROUTINE. If TT is between 0 and 255 inclusive, the
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normal trap vector will be used. If TT is 256, then it's for the SPARClite
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DSU, and that always vectors off to 255 unrelocated.
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*/
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void
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exceptionHandler (tt, routine)
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int tt;
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unsigned long routine;
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{
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struct trap_entry *tb; /* Trap vector base address */
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if (tt != 256)
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tb = (struct trap_entry *) (rdtbr() & ~0xfff);
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else
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{
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tt = 255;
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tb = (struct trap_entry *) 0;
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}
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tb[tt] = fltr_proto;
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tb[tt].sethi_imm22 = routine >> 10;
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tb[tt].jmpl_simm13 = routine & 0x3ff;
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}
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void
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update_leds()
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{
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static unsigned char *leds = (unsigned char *)0x02000003;
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static enum ledtype prev_algorithm = led_none;
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if (prev_algorithm != __led_algorithm)
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{
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*leds = 0xff; /* turn the LEDs off */
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prev_algorithm = __led_algorithm;
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}
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switch (__led_algorithm)
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{
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case led_marching:
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{
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static unsigned char curled = 1;
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static unsigned char dir = 0;
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*leds = ~curled;
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if (dir)
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curled <<= 1;
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else
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curled >>= 1;
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if (curled == 0)
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{
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if (dir)
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curled = 0x80;
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else
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curled = 1;
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dir = ~dir;
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}
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break;
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}
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case led_random:
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{
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static unsigned int next = 0;
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*leds = next & 0xff;
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next = (next * 1103515245 + 12345) & 0x7fff;
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break;
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}
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case led_blinking:
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{
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static unsigned char next = 0;
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*leds = next;
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next = ~next;
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break;
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}
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default:
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break;
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}
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}
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/* 1/5th of a second? */
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#define LEDTIME (20000000 / 500)
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unsigned long ledtime = LEDTIME;
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int
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inbyte()
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{
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return (getDebugChar());
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}
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int
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getDebugChar()
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{
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unsigned long countdown = ledtime;
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update_leds();
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while (1)
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{
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if ((get_uart_status(0) & 2) != 0) break;
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if (countdown-- == 0)
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{
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countdown = ledtime;
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update_leds();
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}
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}
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return rcv_char(0);
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}
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/* Output one character to the serial port */
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void
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outbyte(c)
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int c;
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{
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if (__outbyte_hook)
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__outbyte_hook (c);
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else
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putDebugChar(c);
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}
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void
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putDebugChar(c)
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int c;
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{
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update_leds();
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while ((get_uart_status(0) & 1) == 0) ;
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xmt_char(0, c);
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}
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#if 0
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int
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write(fd, data, length)
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int fd;
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unsigned char *data;
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int length;
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{
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int olength = length;
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while (length--)
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putDebugChar(*data++);
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return olength;
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}
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int
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read(fd, data, length)
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int fd;
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unsigned char *data;
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int length;
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{
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int olength = length;
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int c;
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while (length--)
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*data++ = getDebugChar();
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return olength;
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}
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#endif
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/* Set the baud rate for the serial port, returns 0 for success,
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-1 otherwise */
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#if 0
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int
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set_baud_rate(baudrate)
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int baudrate;
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{
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/* Convert baud rate to uart clock divider */
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switch (baudrate)
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{
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case 38400:
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baudrate = 16;
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break;
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case 19200:
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baudrate = 33;
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break;
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case 9600:
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baudrate = 65;
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break;
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default:
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return -1;
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}
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set_timer_3(baudrate); /* Set it */
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}
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#endif
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