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Subject[PATCH] PC-9800 subarch. support for 2.5.64-ac3 (19/20) SMP
This is the patch to support NEC PC-9800 subarchitecture
against 2.5.64-ac3. (19/20)

SMP support for PC98.
- Support mpc table location.
- Handling EBDA.
- Hnadling warm reset vector.

Regards,
Osamu tomita


diff -Nru linux-2.5.61-ac1/arch/i386/kernel/mpparse.c linux98-2.5.61-ac1/arch/i386/kernel/mpparse.c
--- linux-2.5.61-ac1/arch/i386/kernel/mpparse.c 2003-02-18 08:58:20.000000000 +0900
+++ linux98-2.5.61-ac1/arch/i386/kernel/mpparse.c 2003-02-18 15:52:44.000000000 +0900
@@ -33,6 +33,7 @@

#include <mach_apic.h>
#include <mach_mpparse.h>
+#include <bios_ebda.h>

/* Have we found an MP table */
int smp_found_config;
@@ -654,7 +655,8 @@
* 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");
@@ -708,8 +710,23 @@
printk(KERN_INFO "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);
+ 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.
+ * 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.
+ */
+ 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;
}
@@ -752,9 +769,9 @@
* 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);
+ address = get_bios_ebda();
+ if (address)
+ smp_scan_config(address, 0x400);
}


diff -Nru linux-2.5.63/arch/i386/kernel/smpboot.c linux98-2.5.63/arch/i386/kernel/smpboot.c
--- linux-2.5.63/arch/i386/kernel/smpboot.c 2003-02-25 04:05:31.000000000 +0900
+++ linux98-2.5.63/arch/i386/kernel/smpboot.c 2003-02-28 13:52:18.000000000 +0900
@@ -49,10 +49,10 @@
#include <asm/tlbflush.h>
#include <asm/desc.h>
#include <asm/arch_hooks.h>
-#include "smpboot_hooks.h"

#include <mach_apic.h>
#include <mach_wakecpu.h>
+#include "smpboot_hooks.h"

/* Set if we find a B stepping CPU */
static int __initdata smp_b_stepping;
@@ -823,13 +823,7 @@

store_NMI_vector(&nmi_high, &nmi_low);

- CMOS_WRITE(0xa, 0xf);
- 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");
+ smpboot_setup_warm_reset_vector(start_eip);

/*
* Starting actual IPI sequence...
@@ -1044,7 +1038,7 @@
/*
* Cleanup possible dangling ends...
*/
- smpboot_setup_warm_reset_vector();
+ smpboot_restore_warm_reset_vector();

/*
* Allow the user to impress friends.
diff -Nru linux/include/asm-i386/mach-default/bios_ebda.h linux98/include/asm-i386/mach-default/bios_ebda.h
--- linux/include/asm-i386/mach-default/bios_ebda.h 1970-01-01 09:00:00.000000000 +0900
+++ linux98/include/asm-i386/mach-default/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/include/asm-i386/mach-default/smpboot_hooks.h linux98/include/asm-i386/mach-default/smpboot_hooks.h
--- linux/include/asm-i386/mach-default/smpboot_hooks.h 2003-02-25 04:05:15.000000000 +0900
+++ linux98/include/asm-i386/mach-default/smpboot_hooks.h 2003-02-28 13:56:55.000000000 +0900
@@ -6,7 +6,18 @@
io_apic_irqs = 0;
}

-static inline void smpboot_setup_warm_reset_vector(void)
+static inline void smpboot_setup_warm_reset_vector(unsigned long start_eip)
+{
+ CMOS_WRITE(0xa, 0xf);
+ 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");
+}
+
+static inline void smpboot_restore_warm_reset_vector(void)
{
/*
* Install writable page 0 entry to set BIOS data area.
diff -Nru linux/include/asm-i386/mach-pc9800/bios_ebda.h linux98/include/asm-i386/mach-pc9800/bios_ebda.h
--- linux/include/asm-i386/mach-pc9800/bios_ebda.h 1970-01-01 09:00:00.000000000 +0900
+++ linux98/include/asm-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 -Nru linux/include/asm-i386/mach-pc9800/mach_wakecpu.h linux98/include/asm-i386/mach-pc9800/mach_wakecpu.h
--- linux/include/asm-i386/mach-pc9800/mach_wakecpu.h 1970-01-01 09:00:00.000000000 +0900
+++ linux98/include/asm-i386/mach-pc9800/mach_wakecpu.h 2003-01-10 11:40:16.000000000 +0900
@@ -0,0 +1,45 @@
+#ifndef __ASM_MACH_WAKECPU_H
+#define __ASM_MACH_WAKECPU_H
+
+/*
+ * This file copes with machines that wakeup secondary CPUs by the
+ * INIT, INIT, STARTUP sequence.
+ */
+
+#define WAKE_SECONDARY_VIA_INIT
+
+/*
+ * 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)
+
+#define boot_cpu_apicid boot_cpu_physical_apicid
+
+static inline void wait_for_init_deassert(atomic_t *deassert)
+{
+ while (!atomic_read(deassert));
+ return;
+}
+
+/* Nothing to do for most platforms, since cleared by the INIT cycle */
+static inline void smp_callin_clear_local_apic(void)
+{
+}
+
+static inline void store_NMI_vector(unsigned short *high, unsigned short *low)
+{
+}
+
+static inline void restore_NMI_vector(unsigned short *high, unsigned short *low)
+{
+}
+
+#if APIC_DEBUG
+ #define inquire_remote_apic(apicid) __inquire_remote_apic(apicid)
+#else
+ #define inquire_remote_apic(apicid) {}
+#endif
+
+#endif /* __ASM_MACH_WAKECPU_H */
diff -Nru linux/include/asm-i386/mach-pc9800/smpboot_hooks.h linux98/include/asm-i386/mach-pc9800/smpboot_hooks.h
--- linux/include/asm-i386/mach-pc9800/smpboot_hooks.h 1970-01-01 09:00:00.000000000 +0900
+++ linux98/include/asm-i386/mach-pc9800/smpboot_hooks.h 2003-02-28 13:53:53.000000000 +0900
@@ -0,0 +1,52 @@
+/* two abstractions specific to kernel/smpboot.c, mainly to cater to visws
+ * which needs to alter them. */
+
+static inline void smpboot_clear_io_apic_irqs(void)
+{
+ io_apic_irqs = 0;
+}
+
+static inline void smpboot_setup_warm_reset_vector(unsigned long start_eip)
+{
+ /* reset code is stored in 8255 on PC-9800. */
+ outb(0x0e, 0x37); /* SHUT0 = 0 */
+ 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");
+ /*
+ * 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");
+}
+
+static inline void smpboot_restore_warm_reset_vector(void)
+{
+ /*
+ * Install writable page 0 entry to set BIOS data area.
+ */
+ local_flush_tlb();
+
+ /*
+ * Paranoid: Set warm reset code and vector here back
+ * to default values.
+ */
+ outb(0x0f, 0x37); /* SHUT0 = 1 */
+
+ *((volatile long *) phys_to_virt(0x404)) = 0;
+}
+
+static inline void smpboot_setup_io_apic(void)
+{
+ /*
+ * Here we can be sure that there is an IO-APIC in the system. Let's
+ * go and set it up:
+ */
+ if (!skip_ioapic_setup && nr_ioapics)
+ setup_IO_APIC();
+}
diff -Nru linux/include/asm-i386/mach-visws/smpboot_hooks.h linux98/include/asm-i386/mach-visws/smpboot_hooks.h
--- linux/include/asm-i386/mach-visws/smpboot_hooks.h 2003-02-25 04:05:10.000000000 +0900
+++ linux98/include/asm-i386/mach-visws/smpboot_hooks.h 2003-02-28 13:57:13.000000000 +0900
@@ -1,10 +1,21 @@
+static inline void smpboot_setup_warm_reset_vector(unsigned long start_eip)
+{
+ CMOS_WRITE(0xa, 0xf);
+ 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");
+}
+
/* for visws do nothing for any of these */

static inline void smpboot_clear_io_apic_irqs(void)
{
}

-static inline void smpboot_setup_warm_reset_vector(void)
+static inline void smpboot_restore_warm_reset_vector(void)
{
}

-
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