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Added some support for the old-school 'g0' and 'g4' monitor

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hooks, and removed some old Sun3 cache and interrupt-register
related code.
This commit is contained in:
fredette 2001-04-06 14:36:08 +00:00
parent b1593d9814
commit 353ad332f0
1 changed files with 24 additions and 18 deletions
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42
sys/arch/sun2/sun2/locore.s
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@ -1,7 +1,7 @@
/* $NetBSD: locore.s,v 1.1 2001/03/29 03:24:19 fredette Exp $ */
/* $NetBSD: locore.s,v 1.2 2001/04/06 14:36:08 fredette Exp $ */
/*
* Copyright (c) 2001 Mathew Fredette
* Copyright (c) 2001 Matthew Fredette
* Copyright (c) 1994, 1995 Gordon W. Ross
* Copyright (c) 1993 Adam Glass
* Copyright (c) 1988 University of Utah.
@ -102,6 +102,16 @@ L_per_pmeg:
| Force a long jump to the relocated code (high VA).
jmp L_high_code:l | long jump
| These entry points are here in pretty low memory, so that they
| can be reached from virtual address zero using the classic,
| old-school "g0" and "g4" commands from the monitor. Note that
| on entry, we are in low memory again (i.e., not where we were
| linked.) We do a long jump right away to the relocated code.
L_g0_entry:
jmp _C_LABEL(g0_handler):l | long jump
L_g4_entry:
jmp _C_LABEL(g4_handler):l | long jump
L_high_code:
| We are now running in the correctly relocated kernel, so
| we are no longer restricted to position-independent code.
@ -115,6 +125,18 @@ L_high_code:
movsw d0, SYSTEM_ENAB | disable all interrupts
movw d0, _C_LABEL(enable_reg_soft)
| Set up our g0 and g4 handlers. Note that we reach ourselves
| in low memory again (i.e., not where we were linked), which
| is why we subtract KERNBASE. The 2 and the 6 further adjust
| the offsets to be PC-relative.
movl #0, a0
movw #0x6000, a0@+ | braw
movl #(L_g0_entry-2-KERNBASE), d0
movw d0, a0@+ | L_g0_entry
movw #0x6000, a0@+ | braw
movl #(L_g4_entry-6-KERNBASE), d0
movw d0, a0@+ | L_g4_entry
| Do bootstrap stuff needed before main() gets called.
| Our boot loader leaves a copy of the kernel's exec header
| just before the start of the kernel text segment, so the
@ -337,13 +359,6 @@ GLOBAL(trap0)
* command in d0, addr in a1, length in d1
*/
GLOBAL(trap12)
movl _C_LABEL(curproc),sp@- | push curproc pointer
movl d1,sp@- | push length
movl a1,sp@- | push addr
movl d0,sp@- | push command
lea _C_LABEL(cachectl1),a0
jsr a0@ | do it
lea sp@(16),sp | pop args
jra _ASM_LABEL(rei) | all done
/*
@ -992,15 +1007,6 @@ ENTRY(enable_reg_or)
movc a1,dfc | restore dfc
rts
/*
* This strangely-named function used to initialize the soft enable register that the
* above functions use, and used to disable interrupts entirely, as the intreg_init
* in sun3/intreg.c does. But now we do all of this early in this locore.s, so
* this function does nothing. (It still has to exist because obio_init calls it.)
*/
ENTRY(intreg_init)
rts
| Define some addresses, mostly so DDB can print useful info.
| Not using _C_LABEL() here because these symbols are never
| referenced by any C code, and if the leading underscore