Aren/NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Allow the kernel to be loaded at its link address (aka KERNBASE) by the

Browse Source 
boot program.
This commit is contained in:
pk 2003-02-21 19:04:07 +00:00
parent ebe81c7ec3
commit b7f550c62d
2 changed files with 50 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
sys/arch/sparc/sparc/autoconf.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: autoconf.c,v 1.190 2003/02/18 13:36:52 pk Exp $ */
/* $NetBSD: autoconf.c,v 1.191 2003/02/21 19:04:07 pk Exp $ */
/*
* Copyright (c) 1996
@ -299,8 +299,11 @@ bootstrap()
#ifdef DDB
if ((bi_sym = lookup_bootinfo(BTINFO_SYMTAB)) != NULL) {
bi_sym->ssym += KERNBASE;
bi_sym->esym += KERNBASE;
if (bi_sym->ssym < KERNBASE) {
/* Assume low-loading boot loader */
bi_sym->ssym += KERNBASE;
bi_sym->esym += KERNBASE;
}
ddb_init(bi_sym->nsym, (int *)bi_sym->ssym,
(int *)bi_sym->esym);
} else {

66
sys/arch/sparc/sparc/locore.s
View File

@ -1,4 +1,4 @@
/* $NetBSD: locore.s,v 1.185 2003/01/18 06:45:03 thorpej Exp $ */
/* $NetBSD: locore.s,v 1.186 2003/02/21 19:04:07 pk Exp $ */
/*
* Copyright (c) 1996 Paul Kranenburg
@ -3545,14 +3545,32 @@ dostart:
/*
* Startup.
*
* We have been loaded in low RAM, at some address which
* We may have been loaded in low RAM, at some address which
* is page aligned (PROM_LOADADDR actually) rather than where we
* want to run (KERNBASE+PROM_LOADADDR). Until we get everything set,
* we have to be sure to use only pc-relative addressing.
*/
/*
* We now use the bootinfo method to pass arguments, and the new
* Find out if the above is the case.
*/
0: call 1f
sethi %hi(0b), %l0 ! %l0 = virtual address of 0:
1: or %l0, %lo(0b), %l0
sub %l0, %o7, %l7 ! subtract actual physical address of 0:
/*
* If we're already running at our desired virtual load address,
* %l7 will be set to 0, otherwise it will be KERNBASE.
* From now on until the end of locore bootstrap code, %l7 will
* be used to relocate memory references.
*/
#define RELOCATE(l,r) \
set l, r; \
sub r, %l7, r
/*
* We use the bootinfo method to pass arguments, and the new
* magic number indicates that. A pointer to the kernel top, i.e.
* the first address after the load kernel image (including DDB
* symbols, if any) is passed in %o4[0] and the bootinfo structure
@ -3576,7 +3594,6 @@ dostart:
* the difference between KERNBASE and the old value (known to be
* 0xf8000000) compiled into pre-1.3 bootblocks.
*/
set KERNBASE, %l4
set 0x44444232, %l3 ! bootinfo magic
cmp %o5, %l3
@ -3585,19 +3602,20 @@ dostart:
/* The loader has passed to us a `bootinfo' structure */
ld [%o4], %l3 ! 1st word is kernel_top
add %l3, %l4, %o5 ! relocate: + KERNBASE
sethi %hi(_C_LABEL(kernel_top) - KERNBASE), %l3 ! and store it
st %o5, [%l3 + %lo(_C_LABEL(kernel_top) - KERNBASE)]
add %l3, %l7, %o5 ! relocate: + KERNBASE
RELOCATE(_C_LABEL(kernel_top),%l3)
st %o5, [%l3] ! and store it
ld [%o4 + 4], %l3 ! 2nd word is bootinfo
add %l3, %l4, %o5 ! relocate
sethi %hi(_C_LABEL(bootinfo) - KERNBASE), %l3 ! store bootinfo
st %o5, [%l3 + %lo(_C_LABEL(bootinfo) - KERNBASE)]
add %l3, %l7, %o5 ! relocate
RELOCATE(_C_LABEL(bootinfo),%l3)
st %o5, [%l3] ! store bootinfo
b,a 4f
1:
#ifdef DDB
/* Check for old-style DDB loader magic */
set KERNBASE, %l4
set 0x44444231, %l3 ! Is it DDB_MAGIC1?
cmp %o5, %l3
be,a 2f
@ -3625,8 +3643,8 @@ dostart:
* let it default to `end'.
*/
set end, %o4
sethi %hi(_C_LABEL(kernel_top) - KERNBASE), %l3 ! store kernel_top
st %o4, [%l3 + %lo(_C_LABEL(kernel_top) - KERNBASE)]
RELOCATE(_C_LABEL(kernel_top),%l3)
st %o4, [%l3] ! store kernel_top
4:
@ -3665,15 +3683,15 @@ dostart:
call %o4
mov 0, %o0 ! node
mov %o0, %l0
set cputypvar-KERNBASE, %o1 ! name = "compatible"
set cputypval-KERNBASE, %o2 ! buffer ptr (assume buffer long enough)
!mov %o0, %l0
RELOCATE(cputypvar,%o1) ! name = "compatible"
RELOCATE(cputypval,%l2) ! buffer ptr (assume buffer long enough)
ld [%g7 + PV_NODEOPS], %o4 ! (void)pv->pv_nodeops->no_getprop(...)
ld [%o4 + NO_GETPROP], %o4
call %o4
nop
set cputypval-KERNBASE, %o2 ! buffer ptr
ldub [%o2 + 4], %o0 ! which is it... "sun4c", "sun4m", "sun4d"?
mov %l2, %o2
!set cputypval-KERNBASE, %o2 ! buffer ptr
ldub [%l2 + 4], %o0 ! which is it... "sun4c", "sun4m", "sun4d"?
cmp %o0, 'c'
be is_sun4c
nop
@ -3705,7 +3723,7 @@ is_sun4m:
b start_havetype
mov CPU_SUN4M, %g4
#else
set sun4m_notsup-KERNBASE, %o0
RELOCATE(sun4m_notsup,%o0)
ld [%g7 + PV_EVAL], %o1
call %o1 ! print a message saying that the
nop ! sun4m architecture is not supported
@ -3721,7 +3739,7 @@ is_sun4d:
b start_havetype
mov CPU_SUN4D, %g4
#else
set sun4d_notsup-KERNBASE, %o0
RELOCATE(sun4d_notsup,%o0)
ld [%g7 + PV_EVAL], %o1
call %o1 ! print a message saying that the
nop ! sun4d architecture is not supported
@ -3741,7 +3759,7 @@ is_sun4c:
b start_havetype
mov CPU_SUN4C, %g4 ! XXX CPU_SUN4
#else
set sun4c_notsup-KERNBASE, %o0
RELOCATE(sun4c_notsup,%o0)
ld [%g7 + PV_ROMVEC_VERS], %o1
cmp %o1, 0
@ -3751,6 +3769,7 @@ is_sun4c:
! stupid version 0 rom interface is pv_eval(int length, char *string)
mov %o0, %o1
2: ldub [%o0], %o4
tst %o4
bne 2b
inc %o0
dec %o0
@ -3777,7 +3796,7 @@ is_sun4:
#else
set PROM_BASE, %g7
set sun4_notsup-KERNBASE, %o0
RELOCATE(sun4_notsup,%o0)
ld [%g7 + OLDMON_PRINTF], %o1
call %o1 ! print a message saying that the
nop ! sun4 architecture is not supported
@ -3788,6 +3807,9 @@ is_sun4:
#endif
start_havetype:
cmp %l7, 0
be startmap_done
/*
* Step 1: double map low RAM (addresses [0.._end-start-1])
* to KERNBASE (addresses [KERNBASE.._end-1]). None of these