pmac_smp.c

这个linux源代码是很全面的~基本完整了~使用c编译的~由于时间问题我没有亲自测试~但就算用来做参考资料也是非常好的

/*
 * BK Id: %F% %I% %G% %U% %#%
 */
/*
 * SMP support for power macintosh.
 *
 * We support both the old "powersurge" SMP architecture
 * and the current Core99 (G4 PowerMac) machines.
 *
 * Support Macintosh G4 SMP by Troy Benjegerdes ([e-mail])
 * and Ben Herrenschmidt <[e-mail]>.
 *
 * Support for DayStar quad CPU cards
 * Copyright (C) XLR8, Inc. 1994-2000
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version
 *  2 of the License, or (at your option) any later version.
 */
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
#include <linux/delay.h>
#define __KERNEL_SYSCALLS__
#include <linux/unistd.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/stringify.h>

#include <asm/ptrace.h>
#include <asm/atomic.h>
#include <asm/irq.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/hardirq.h>
#include <asm/softirq.h>
#include <asm/sections.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/smp.h>
#include <asm/residual.h>
#include <asm/machdep.h>
#include <asm/pmac_feature.h>
#include <asm/time.h>
#include <asm/open_pic.h>
#include <asm/processor.h>

/*
 * Powersurge (old powermac SMP) support.
 */

extern void __secondary_start_psurge(void);
extern void __secondary_start_psurge2(void);	/* Temporary horrible hack */
extern void __secondary_start_psurge3(void);	/* Temporary horrible hack */

/* Addresses for powersurge registers */
#define HAMMERHEAD_BASE		0xf8000000
#define HHEAD_CONFIG		0x90
#define HHEAD_SEC_INTR		0xc0

/* register for interrupting the primary processor on the powersurge */
/* N.B. this is actually the ethernet ROM! */
#define PSURGE_PRI_INTR		0xf3019000

/* register for storing the start address for the secondary processor */
/* N.B. this is the PCI config space address register for the 1st bridge */
#define PSURGE_START		0xf2800000

/* Daystar/XLR8 4-CPU card */
#define PSURGE_QUAD_REG_ADDR	0xf8800000

#define PSURGE_QUAD_IRQ_SET	0
#define PSURGE_QUAD_IRQ_CLR	1
#define PSURGE_QUAD_IRQ_PRIMARY	2
#define PSURGE_QUAD_CKSTOP_CTL	3
#define PSURGE_QUAD_PRIMARY_ARB	4
#define PSURGE_QUAD_BOARD_ID	6
#define PSURGE_QUAD_WHICH_CPU	7
#define PSURGE_QUAD_CKSTOP_RDBK	8
#define PSURGE_QUAD_RESET_CTL	11

#define PSURGE_QUAD_OUT(r, v)	(out_8(quad_base + ((r) << 4) + 4, (v)))
#define PSURGE_QUAD_IN(r)	(in_8(quad_base + ((r) << 4) + 4) & 0x0f)
#define PSURGE_QUAD_BIS(r, v)	(PSURGE_QUAD_OUT((r), PSURGE_QUAD_IN(r) | (v)))
#define PSURGE_QUAD_BIC(r, v)	(PSURGE_QUAD_OUT((r), PSURGE_QUAD_IN(r) & ~(v)))

/* virtual addresses for the above */
static volatile u8 *hhead_base;
static volatile u8 *quad_base;
static volatile u32 *psurge_pri_intr;
static volatile u8 *psurge_sec_intr;
static volatile u32 *psurge_start;

/* what sort of powersurge board we have */
static int psurge_type;

/* values for psurge_type */
#define PSURGE_DUAL		0
#define PSURGE_QUAD_OKEE	1
#define PSURGE_QUAD_COTTON	2
#define PSURGE_QUAD_ICEGRASS	3

volatile static long int core99_l2_cache;
volatile static long int core99_l3_cache;

static void __init
core99_init_caches(void)
{
	int cpu = smp_processor_id();

	if (!(cur_cpu_spec[0]->cpu_features & CPU_FTR_L2CR))
		return;

	if (cpu == 0){
		core99_l2_cache = _get_L2CR();
		printk("CPU0: L2CR is %lx\n", core99_l2_cache);
	} else {
		printk("CPU%d: L2CR was %lx\n", cpu, _get_L2CR());
		_set_L2CR(0);
		_set_L2CR(core99_l2_cache);
		printk("CPU%d: L2CR set to %lx\n", cpu, core99_l2_cache);
	}

	if (!(cur_cpu_spec[0]->cpu_features & CPU_FTR_L3CR))
		return;

	if (cpu == 0){
		core99_l3_cache = _get_L3CR();
		printk("CPU0: L3CR is %lx\n", core99_l3_cache);
	} else {
		printk("CPU%d: L3CR was %lx\n", cpu, _get_L3CR());
		_set_L3CR(0);
		_set_L3CR(core99_l3_cache);
		printk("CPU%d: L3CR set to %lx\n", cpu, core99_l3_cache);
	}
}

/* Some CPU registers have to be saved from the first CPU and
 * applied to others. Note that we override what is setup by
 * the cputable intentionally.
 */

#define	reg_hid0	0
#define	reg_hid1	1
#define	reg_msscr0	2
#define	reg_msssr0	3
#define	reg_ictrl	4
#define	reg_ldstcr	5
#define	reg_ldstdb	6
#define	reg_count	7

#define stringify __stringify

static unsigned long cpu_regs[reg_count];

static void __pmac
cpu_setup_grab(void)
{
	unsigned int pvers = mfspr(SPRN_PVR)>>16;

	/* Read cache setting of CPU 0 */
	core99_init_caches();

	/* 7400/7410/7450 */
	if (pvers == 0x8000 || pvers == 0x000c || pvers == 0x800c) {
		cpu_regs[reg_hid0] = mfspr(SPRN_HID0);
		cpu_regs[reg_msscr0] = mfspr(SPRN_MSSCR0);
		cpu_regs[reg_msssr0] = mfspr(SPRN_MSSSR0);
	}
	/* 7450 only */
	if (pvers == 0x8000) {
		cpu_regs[reg_hid1] = mfspr(SPRN_HID1);
		cpu_regs[reg_ictrl] = mfspr(SPRN_ICTRL);
		cpu_regs[reg_ldstcr] = mfspr(SPRN_LDSTCR);
		cpu_regs[reg_ldstdb] = mfspr(SPRN_LDSTDB);
	}
	flush_dcache_range((unsigned long)cpu_regs, (unsigned long)&cpu_regs[reg_count]);
}

static void __pmac
cpu_setup_apply(int cpu_nr)
{
	unsigned int pvers = mfspr(SPRN_PVR)>>16;

	/* Apply cache setting from CPU 0 */
	core99_init_caches();

	/* 7400/7410/7450 */
	if (pvers == 0x8000 || pvers == 0x000c || pvers == 0x800c) {
		unsigned long tmp;
		__asm__ __volatile__ (
			"lwz	%0,4*"stringify(reg_hid0)"(%1)\n"
			"sync\n"
			"mtspr	"stringify(SPRN_HID0)", %0\n"
			"isync;sync\n"
			"lwz	%0, 4*"stringify(reg_msscr0)"(%1)\n"
			"sync\n"
			"mtspr	"stringify(SPRN_MSSCR0)", %0\n"
			"isync;sync\n"
//			"lwz	%0, "stringify(reg_msssr0)"(%1)\n"
//			"sync\n"
//			"mtspr	"stringify(SPRN_MSSSR0)", %0\n"
//			"isync;sync\n"
		: "=&r" (tmp) : "r" (cpu_regs));			
	}
	/* 7410 only */
	if (pvers == 0x800c) {
		unsigned long tmp;
		__asm__ __volatile__ (
			"li	%0, 0\n"
			"sync\n"
			"mtspr	"stringify(SPRN_L2CR2)", %0\n"
			"isync;sync\n"
		: "=&r" (tmp));		
	}
	/* 7450 only */
	if (pvers == 0x8000) {
		unsigned long tmp;
		__asm__ __volatile__ (
			"lwz	%0, 4*"stringify(reg_hid1)"(%1)\n"
			"sync\n"
			"mtspr	"stringify(SPRN_HID1)", %0\n"
			"isync;sync\n"
			"lwz	%0, 4*"stringify(reg_ictrl)"(%1)\n"
			"sync\n"
			"mtspr	"stringify(SPRN_ICTRL)", %0\n"
			"isync;sync\n"
			"lwz	%0, 4*"stringify(reg_ldstcr)"(%1)\n"
			"sync\n"
			"mtspr	"stringify(SPRN_LDSTCR)", %0\n"
			"isync;sync\n"
			"lwz	%0, 4*"stringify(reg_ldstdb)"(%1)\n"
			"sync\n"
			"mtspr	"stringify(SPRN_LDSTDB)", %0\n"
			"isync;sync\n"
		: "=&r" (tmp) : "r" (cpu_regs));		
	}
}

/*
 * Set and clear IPIs for powersurge.
 */
static inline void psurge_set_ipi(int cpu)
{
	if (cpu == 0)
		in_be32(psurge_pri_intr);
	else if (psurge_type == PSURGE_DUAL)
		out_8(psurge_sec_intr, 0);
	else
		PSURGE_QUAD_OUT(PSURGE_QUAD_IRQ_SET, 1 << cpu);
}

static inline void psurge_clr_ipi(int cpu)
{
	if (cpu > 0) {
		if (psurge_type == PSURGE_DUAL)
			out_8(psurge_sec_intr, ~0);
		else
			PSURGE_QUAD_OUT(PSURGE_QUAD_IRQ_CLR, 1 << cpu);
	}
}

/*
 * On powersurge (old SMP powermac architecture) we don't have
 * separate IPIs for separate messages like openpic does.  Instead
 * we have a bitmap for each processor, where a 1 bit means that
 * the corresponding message is pending for that processor.
 * Ideally each cpu's entry would be in a different cache line.
 *  -- paulus.
 */
static unsigned long psurge_smp_message[NR_CPUS];

void __pmac
psurge_smp_message_recv(struct pt_regs *regs)
{
	int cpu = smp_processor_id();
	int msg;

	/* clear interrupt */
	psurge_clr_ipi(cpu);

	if (smp_num_cpus < 2)
		return;

	/* make sure there is a message there */
	for (msg = 0; msg < 4; msg++)
		if (test_and_clear_bit(msg, &psurge_smp_message[cpu]))
			smp_message_recv(msg, regs);
}

void __pmac
psurge_primary_intr(int irq, void *d, struct pt_regs *regs)
{
	psurge_smp_message_recv(regs);
}

static void __pmac
smp_psurge_message_pass(int target, int msg, unsigned long data, int wait)
{
	int i;

	if (smp_num_cpus < 2)
		return;

	for (i = 0; i < smp_num_cpus; i++) {
		if (target == MSG_ALL
		    || (target == MSG_ALL_BUT_SELF && i != smp_processor_id())