diff options
Diffstat (limited to 'src/cpu/amd/geode_gx1/cpu_setup.inc')
| -rw-r--r-- | src/cpu/amd/geode_gx1/cpu_setup.inc | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/src/cpu/amd/geode_gx1/cpu_setup.inc b/src/cpu/amd/geode_gx1/cpu_setup.inc new file mode 100644 index 0000000000..d701f8d226 --- /dev/null +++ b/src/cpu/amd/geode_gx1/cpu_setup.inc @@ -0,0 +1,68 @@ +/* + freebios/src/northbridge/nsc/gx1/cpu_setup.inc + + Copyright (c) 2002 Christer Weinigel <wingel@hack.org> + + Initialize the GX1 CPU configuration registers +*/ + +/* USES: esi, ecx, eax */ + +#include <cpu/amd/gx1def.h> + + movl %eax, %ebp /* preserve bist */ + +cpu_setup_start: + leal cpu_setup_table, %esi + movl $cpu_setup_len, %ecx + +cpu_setup_loop: + movw (%esi), %ax + addl $2, %esi + outb %al, $0x22 + movb %ah, %al + outb %al, $0x23 + loop cpu_setup_loop + + movb $0xff, %al /* DIR1 -- Identification Register 1 */ + outb %al, $0x22 + inb $0x23, %al + cmpb $0x63, %al /* Revision for GXLV rev 3 */ + jbe cpu_no_ccr4 + + movb $0xe8, %al /* CCR4 */ + outb %al, $0x22 + inb $0x23, %al + orb $0x20, %al /* Enable FPU Fast Mode */ + outb %al, $0x23 + + movb $0xf0, %al /* PCR1 --- Performace Control */ + outb %al, $0x22 + inb $0x23, %al + orb $0x02, %al /* Incrementor on, whatever that is */ + outb %al, $0x23 + + movb $0x20, %al /* PCR0 --- Performace Control */ + outb %al, $0x22 + inb $0x23, %al + orb $0x20, %al /* Must be 1 according to data book */ + orb $0x04, %al /* Incrementor Margin 10 */ + outb %al, $0x23 +cpu_no_ccr4: + + jmp cpu_setup_end + +cpu_setup_table: + .byte 0xc1, 0x00 /* NO SMIs */ + .byte 0xc3, 0x14 /* Enable CPU config register */ + .byte 0x20, 0x00 + .byte 0xb8, GX_BASE>>30 /* Enable GXBASE address */ + .byte 0xc2, 0x00 + .byte 0xe8, 0x98 + .byte 0xc3, 0xf8 /* Enable CPU config register */ +cpu_setup_len = (.-cpu_setup_table)/2 + +cpu_setup_end: + nop + + movl %ebp, %eax /* Restore bist */ |