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Move 32bit switch to 32bitmode.i

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This commit is contained in:
Laurent Vivier 2005-11-25 19:53:47 +00:00
parent f51aab30c9
commit ebcb14eaa7
2 changed files with 48 additions and 41 deletions
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45
first/32bitmode.i Normal file
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@ -0,0 +1,45 @@
.macro switch32bitmode
/* is a 32bit aware ROM ? */
movea.l ROMBase,%a0
move.w 8(%a0), %d1 /* read ROM id */
cmp.w #0x0178, %d1 /* only 24bit ROM */
bls.S bit32_ok
/* is a 32bit aware processor ? */
cmp.w #1, CPUFlags /* Is 68000 or 68010 */
bls.S bit32_ok
/* test if we are in 32bit mode */
move.l #-1, %d0
StripAddress
cmp.l #-1, %d0
beq.S bit32_ok
/* Switch to 32bit mode */
lea PRAM_buffer(%pc), %a0 /* where to store data */
move.w #1, %d0 /* size of data */
swap %d0
move.w #0x08A, %d0 /* offset in PRAM */
ReadXPRam
lea PRAM_buffer(%pc), %a0
or.b #0x05, (%a0)
move.w #1, %d0 /* size of data */
swap %d0
move.w #0x08A, %d0 /* offset in PRAM */
WriteXPRam
/* jump to reset function in ROM */
movea.l ROMBase,%a0
jmp 0x90(%a0)
bit32_ok:
.endm

44
first/first.S
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@ -10,6 +10,7 @@
.equ first_level_size, 2 * sector_size .equ first_level_size, 2 * sector_size
.include "macos.i" .include "macos.i"
.include "32bitmode.i"
/****************************************************************************** /******************************************************************************
* *
@ -63,48 +64,9 @@ start:
SetApplBase SetApplBase
movel SysZone,TheZone movel SysZone,TheZone
/* is a 32bit aware ROM ? */ /* test if we are in 32bit mode, otherwise reboot in 32bit mode */
movea.l ROMBase,%a0 switch32bitmode
move.w 8(%a0), %d1 /* read ROM id */
cmp.w #0x0178, %d1 /* only 24bit ROM */
bls.S bit32_ok
/* is a 32bit aware processor ? */
cmp.w #1, CPUFlags /* Is 68000 or 68010 */
bls.S bit32_ok
/* test if we are in 32bit mode */
move.l #-1, %d0
StripAddress
cmp.l #-1, %d0
beq.S bit32_ok
/* Switch to 32bit mode */
lea PRAM_buffer(%pc), %a0 /* where to store data */
move.w #1, %d0 /* size of data */
swap %d0
move.w #0x08A, %d0 /* offset in PRAM */
ReadXPRam
lea PRAM_buffer(%pc), %a0
or.b #0x05, (%a0)
move.w #1, %d0 /* size of data */
swap %d0
move.w #0x08A, %d0 /* offset in PRAM */
WriteXPRam
/* jump to reset function in ROM */
movea.l ROMBase,%a0
jmp 0x90(%a0)
bit32_ok:
/* buffer size to store second stage booter */ /* buffer size to store second stage booter */