Alan Cox wrote:
> Slight misunderstanding: I just meant put the
>
> static inline int get_ebda(void)
> {
> unsigned int address = *(unsigned short *)phys_to_virt(0x40E);
> address <<= 4;
> return address; /* 0 means none */
> }
>
> then do
>
> addr = get_ebda();
> if(addr)
> spm_scan_config(...)
>
> Which actually fixes a bug too - the real PC can have no EBDA (EBDA
> value of zero) and we shouldnt scan it if so
Oh, I see. Here is a patch rewrited.
Thanks,
Osamu
diff -urN linux/arch/i386/kernel/mpparse.c linux98/arch/i386/kernel/mpparse.c
--- linux/arch/i386/kernel/mpparse.c 2002-12-10 09:17:48.000000000 +0900
+++ linux98/arch/i386/kernel/mpparse.c 2002-12-18 22:22:24.000000000 +0900
@@ -31,6 +31,7 @@
#include <asm/pgalloc.h>
#include <asm/io_apic.h>
#include "mach_apic.h"
+#include "bios_ebda.h"
/* Have we found an MP table */
int smp_found_config;
@@ -676,11 +677,14 @@
printk(KERN_DEBUG "Default MP configuration #%d\n", mpf->mpf_feature1);
construct_default_ISA_mptable(mpf->mpf_feature1);
} else if (mpf->mpf_physptr) {
+ extern int pc98;
+
/*
* Read the physical hardware table. Anything here will
* override the defaults.
*/
- if (!smp_read_mpc((void *)mpf->mpf_physptr)) {
+ if (!smp_read_mpc(pc98 ? phys_to_virt(mpf->mpf_physptr)
+ : (void *)mpf->mpf_physptr)) {
smp_found_config = 0;
printk(KERN_ERR "BIOS bug, MP table errors detected!...\n");
printk(KERN_ERR "... disabling SMP support. (tell your hw vendor)\n");
@@ -734,8 +738,25 @@
Dprintk("found SMP MP-table at %08lx\n",
virt_to_phys(mpf));
reserve_bootmem(virt_to_phys(mpf), PAGE_SIZE);
- if (mpf->mpf_physptr)
- reserve_bootmem(mpf->mpf_physptr, PAGE_SIZE);
+ /*
+ * PC-9800's MPC table places on the very last of
+ * physical memory; so that simply reserving PAGE_SIZE
+ * from mpg->mpf_physptr yields BUG() in
+ * reserve_bootmem.
+ */
+ if (mpf->mpf_physptr) {
+ /*
+ * We cannot access to MPC table to compute
+ * table size yet, as only few megabytes from
+ * the bottom is mapped now.
+ */
+ unsigned long size = PAGE_SIZE;
+ unsigned long end = max_low_pfn * PAGE_SIZE;
+ if (mpf->mpf_physptr + size > end)
+ size = end - mpf->mpf_physptr;
+ reserve_bootmem(mpf->mpf_physptr, size);
+ }
+
mpf_found = mpf;
return 1;
}
@@ -778,12 +799,14 @@
* MP1.4 SPEC states to only scan first 1K of 4K EBDA.
*/
- address = *(unsigned short *)phys_to_virt(0x40E);
- address <<= 4;
- smp_scan_config(address, 0x400);
- /* This has been safe for ages */
- if (smp_found_config)
- Dprintk(KERN_WARNING "WARNING: MP table in the EBDA can be UNSAFE, contact linux-smp@vger.kernel.org if you experience SMP problems!\n");
+ address = get_bios_ebda();
+ if (address)
+ {
+ smp_scan_config(address, 0x400);
+ /* This has been safe for ages */
+ if (smp_found_config)
+ Dprintk(KERN_WARNING "WARNING: MP table in the EBDA can be UNSAFE, contact linux-smp@vger.kernel.org if you experience SMP problems!\n");
+ }
}
diff -Nru linux-2.5.50-ac1/arch/i386/mach-defaults/bios_ebda.h linux98-2.5.50-ac1/arch/i386/mach-defaults/bios_ebda.h
--- linux-2.5.50-ac1/arch/i386/mach-defaults/bios_ebda.h 1970-01-01 09:00:00.000000000 +0900
+++ linux98-2.5.50-ac1/arch/i386/mach-defaults/bios_ebda.h 2002-12-18 22:40:38.000000000 +0900
@@ -0,0 +1,15 @@
+#ifndef _MACH_BIOS_EBDA_H
+#define _MACH_BIOS_EBDA_H
+
+/*
+ * there is a real-mode segmented pointer pointing to the
+ * 4K EBDA area at 0x40E.
+ */
+static inline unsigned int get_bios_ebda(void)
+{
+ unsigned int address = *(unsigned short *)phys_to_virt(0x40E);
+ address <<= 4;
+ return address; /* 0 means none */
+}
+
+#endif /* _MACH_BIOS_EBDA_H */
diff -Nru linux-2.5.50-ac1/arch/i386/mach-pc9800/bios_ebda.h linux98-2.5.50-ac1/arch/i386/mach-pc9800/bios_ebda.h
--- linux-2.5.50-ac1/arch/i386/mach-pc9800/bios_ebda.h 1970-01-01 09:00:00.000000000 +0900
+++ linux98-2.5.50-ac1/arch/i386/mach-pc9800/bios_ebda.h 2002-12-18 22:49:59.000000000 +0900
@@ -0,0 +1,14 @@
+#ifndef _MACH_BIOS_EBDA_H
+#define _MACH_BIOS_EBDA_H
+
+/*
+ * PC-9800 has no EBDA.
+ * Its BIOS uses 0x40E for other purpose,
+ * Not pointer to 4K EBDA area.
+ */
+static inline unsigned int get_bios_ebda(void)
+{
+ return 0; /* 0 means none */
+}
+
+#endif /* _MACH_BIOS_EBDA_H */
diff -urN linux/arch/i386/kernel/smpboot.c linux98/arch/i386/kernel/smpboot.c
--- linux/arch/i386/kernel/smpboot.c 2002-12-10 09:17:49.000000000 +0900
+++ linux98/arch/i386/kernel/smpboot.c 2002-12-10 10:43:32.000000000 +0900
@@ -856,13 +856,27 @@
nmi_low = *((volatile unsigned short *) TRAMPOLINE_LOW);
}
+#ifndef CONFIG_PC9800
CMOS_WRITE(0xa, 0xf);
+#else
+ /* reset code is stored in 8255 on PC-9800. */
+ outb(0x0e, 0x37); /* SHUT0 = 0 */
+#endif
local_flush_tlb();
Dprintk("1.\n");
*((volatile unsigned short *) TRAMPOLINE_HIGH) = start_eip >> 4;
Dprintk("2.\n");
*((volatile unsigned short *) TRAMPOLINE_LOW) = start_eip & 0xf;
Dprintk("3.\n");
+#ifdef CONFIG_PC9800
+ /*
+ * On PC-9800, continuation on warm reset is done by loading
+ * %ss:%sp from 0x0000:0404 and executing 'lret', so:
+ */
+ /* 0x3f0 is on unused interrupt vector and should be safe... */
+ *((volatile unsigned long *) phys_to_virt(0x404)) = 0x000003f0;
+ Dprintk("4.\n");
+#endif
/*
* Be paranoid about clearing APIC errors.
diff -urN linux/include/asm-i386/smpboot.h linux98/include/asm-i386/smpboot.h
--- linux/include/asm-i386/smpboot.h Sat Oct 12 13:22:19 2002
+++ linux98/include/asm-i386/smpboot.h Sat Oct 12 19:33:46 2002
@@ -13,8 +13,17 @@
#define TRAMPOLINE_LOW phys_to_virt(0x8)
#define TRAMPOLINE_HIGH phys_to_virt(0xa)
#else /* !CONFIG_CLUSTERED_APIC */
+ #ifndef CONFIG_PC9800
#define TRAMPOLINE_LOW phys_to_virt(0x467)
#define TRAMPOLINE_HIGH phys_to_virt(0x469)
+ #else /* CONFIG_PC9800 */
+ /*
+ * On PC-9800, continuation on warm reset is done by loading
+ * %ss:%sp from 0x0000:0404 and executing 'lret', so:
+ */
+ #define TRAMPOLINE_LOW phys_to_virt(0x4fa)
+ #define TRAMPOLINE_HIGH phys_to_virt(0x4fc)
+ #endif /* !CONFIG_PC9800 */
#endif /* CONFIG_CLUSTERED_APIC */
#ifdef CONFIG_CLUSTERED_APIC
-
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