425 lines
9.2 KiB
C
425 lines
9.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/arch/sparc/kernel/setup.c
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*
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* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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* Copyright (C) 2000 Anton Blanchard (anton@samba.org)
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*/
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/stddef.h>
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#include <linux/unistd.h>
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#include <linux/ptrace.h>
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#include <linux/slab.h>
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#include <linux/initrd.h>
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#include <asm/smp.h>
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#include <linux/user.h>
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#include <linux/screen_info.h>
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#include <linux/delay.h>
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#include <linux/fs.h>
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#include <linux/seq_file.h>
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#include <linux/syscalls.h>
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#include <linux/kdev_t.h>
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#include <linux/major.h>
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#include <linux/string.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/console.h>
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#include <linux/spinlock.h>
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#include <linux/root_dev.h>
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#include <linux/cpu.h>
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#include <linux/kdebug.h>
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#include <linux/export.h>
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#include <linux/start_kernel.h>
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#include <uapi/linux/mount.h>
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#include <asm/io.h>
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#include <asm/processor.h>
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#include <asm/oplib.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/traps.h>
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#include <asm/vaddrs.h>
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#include <asm/mbus.h>
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#include <asm/idprom.h>
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#include <asm/cpudata.h>
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#include <asm/setup.h>
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#include <asm/cacheflush.h>
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#include <asm/sections.h>
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#include "kernel.h"
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struct screen_info screen_info = {
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0, 0, /* orig-x, orig-y */
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0, /* unused */
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0, /* orig-video-page */
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0, /* orig-video-mode */
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128, /* orig-video-cols */
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0,0,0, /* ega_ax, ega_bx, ega_cx */
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54, /* orig-video-lines */
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0, /* orig-video-isVGA */
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16 /* orig-video-points */
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};
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/* Typing sync at the prom prompt calls the function pointed to by
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* romvec->pv_synchook which I set to the following function.
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* This should sync all filesystems and return, for now it just
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* prints out pretty messages and returns.
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*/
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/* Pretty sick eh? */
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static void prom_sync_me(void)
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{
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unsigned long prom_tbr, flags;
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/* XXX Badly broken. FIX! - Anton */
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local_irq_save(flags);
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__asm__ __volatile__("rd %%tbr, %0\n\t" : "=r" (prom_tbr));
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__asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t" : : "r" (&trapbase));
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prom_printf("PROM SYNC COMMAND...\n");
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show_free_areas(0, NULL);
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if (!is_idle_task(current)) {
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local_irq_enable();
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ksys_sync();
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local_irq_disable();
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}
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prom_printf("Returning to prom\n");
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__asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t" : : "r" (prom_tbr));
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local_irq_restore(flags);
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}
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static unsigned int boot_flags __initdata = 0;
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#define BOOTME_DEBUG 0x1
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/* Exported for mm/init.c:paging_init. */
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unsigned long cmdline_memory_size __initdata = 0;
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/* which CPU booted us (0xff = not set) */
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unsigned char boot_cpu_id = 0xff; /* 0xff will make it into DATA section... */
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static void
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prom_console_write(struct console *con, const char *s, unsigned int n)
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{
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prom_write(s, n);
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}
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static struct console prom_early_console = {
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.name = "earlyprom",
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.write = prom_console_write,
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.flags = CON_PRINTBUFFER | CON_BOOT,
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.index = -1,
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};
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/*
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* Process kernel command line switches that are specific to the
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* SPARC or that require special low-level processing.
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*/
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static void __init process_switch(char c)
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{
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switch (c) {
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case 'd':
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boot_flags |= BOOTME_DEBUG;
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break;
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case 's':
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break;
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case 'h':
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prom_printf("boot_flags_init: Halt!\n");
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prom_halt();
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break;
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case 'p':
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prom_early_console.flags &= ~CON_BOOT;
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break;
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default:
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printk("Unknown boot switch (-%c)\n", c);
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break;
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}
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}
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static void __init boot_flags_init(char *commands)
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{
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while (*commands) {
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/* Move to the start of the next "argument". */
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while (*commands == ' ')
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commands++;
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/* Process any command switches, otherwise skip it. */
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if (*commands == '\0')
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break;
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if (*commands == '-') {
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commands++;
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while (*commands && *commands != ' ')
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process_switch(*commands++);
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continue;
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}
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if (!strncmp(commands, "mem=", 4)) {
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/*
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* "mem=XXX[kKmM] overrides the PROM-reported
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* memory size.
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*/
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cmdline_memory_size = simple_strtoul(commands + 4,
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&commands, 0);
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if (*commands == 'K' || *commands == 'k') {
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cmdline_memory_size <<= 10;
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commands++;
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} else if (*commands=='M' || *commands=='m') {
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cmdline_memory_size <<= 20;
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commands++;
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}
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}
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while (*commands && *commands != ' ')
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commands++;
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}
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}
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extern unsigned short root_flags;
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extern unsigned short root_dev;
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extern unsigned short ram_flags;
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#define RAMDISK_IMAGE_START_MASK 0x07FF
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#define RAMDISK_PROMPT_FLAG 0x8000
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#define RAMDISK_LOAD_FLAG 0x4000
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extern int root_mountflags;
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char reboot_command[COMMAND_LINE_SIZE];
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struct cpuid_patch_entry {
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unsigned int addr;
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unsigned int sun4d[3];
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unsigned int leon[3];
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};
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extern struct cpuid_patch_entry __cpuid_patch, __cpuid_patch_end;
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static void __init per_cpu_patch(void)
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{
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struct cpuid_patch_entry *p;
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if (sparc_cpu_model == sun4m) {
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/* Nothing to do, this is what the unpatched code
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* targets.
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*/
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return;
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}
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p = &__cpuid_patch;
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while (p < &__cpuid_patch_end) {
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unsigned long addr = p->addr;
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unsigned int *insns;
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switch (sparc_cpu_model) {
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case sun4d:
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insns = &p->sun4d[0];
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break;
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case sparc_leon:
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insns = &p->leon[0];
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break;
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default:
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prom_printf("Unknown cpu type, halting.\n");
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prom_halt();
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}
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*(unsigned int *) (addr + 0) = insns[0];
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flushi(addr + 0);
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*(unsigned int *) (addr + 4) = insns[1];
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flushi(addr + 4);
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*(unsigned int *) (addr + 8) = insns[2];
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flushi(addr + 8);
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p++;
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}
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}
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struct leon_1insn_patch_entry {
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unsigned int addr;
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unsigned int insn;
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};
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enum sparc_cpu sparc_cpu_model;
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EXPORT_SYMBOL(sparc_cpu_model);
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static __init void leon_patch(void)
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{
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struct leon_1insn_patch_entry *start = (void *)__leon_1insn_patch;
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struct leon_1insn_patch_entry *end = (void *)__leon_1insn_patch_end;
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/* Default instruction is leon - no patching */
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if (sparc_cpu_model == sparc_leon)
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return;
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while (start < end) {
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unsigned long addr = start->addr;
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*(unsigned int *)(addr) = start->insn;
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flushi(addr);
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start++;
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}
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}
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struct tt_entry *sparc_ttable;
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static struct pt_regs fake_swapper_regs;
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/* Called from head_32.S - before we have setup anything
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* in the kernel. Be very careful with what you do here.
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*/
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void __init sparc32_start_kernel(struct linux_romvec *rp)
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{
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prom_init(rp);
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/* Set sparc_cpu_model */
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sparc_cpu_model = sun_unknown;
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if (!strcmp(&cputypval[0], "sun4m"))
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sparc_cpu_model = sun4m;
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if (!strcmp(&cputypval[0], "sun4s"))
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sparc_cpu_model = sun4m; /* CP-1200 with PROM 2.30 -E */
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if (!strcmp(&cputypval[0], "sun4d"))
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sparc_cpu_model = sun4d;
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if (!strcmp(&cputypval[0], "sun4e"))
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sparc_cpu_model = sun4e;
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if (!strcmp(&cputypval[0], "sun4u"))
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sparc_cpu_model = sun4u;
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if (!strncmp(&cputypval[0], "leon" , 4))
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sparc_cpu_model = sparc_leon;
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leon_patch();
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start_kernel();
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}
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void __init setup_arch(char **cmdline_p)
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{
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int i;
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unsigned long highest_paddr;
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sparc_ttable = &trapbase;
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/* Initialize PROM console and command line. */
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*cmdline_p = prom_getbootargs();
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strlcpy(boot_command_line, *cmdline_p, COMMAND_LINE_SIZE);
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parse_early_param();
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boot_flags_init(*cmdline_p);
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register_console(&prom_early_console);
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switch(sparc_cpu_model) {
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case sun4m:
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pr_info("ARCH: SUN4M\n");
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break;
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case sun4d:
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pr_info("ARCH: SUN4D\n");
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break;
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case sun4e:
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pr_info("ARCH: SUN4E\n");
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break;
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case sun4u:
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pr_info("ARCH: SUN4U\n");
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break;
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case sparc_leon:
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pr_info("ARCH: LEON\n");
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break;
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default:
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pr_info("ARCH: UNKNOWN!\n");
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break;
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}
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#ifdef CONFIG_DUMMY_CONSOLE
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conswitchp = &dummy_con;
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#endif
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idprom_init();
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load_mmu();
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phys_base = 0xffffffffUL;
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highest_paddr = 0UL;
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for (i = 0; sp_banks[i].num_bytes != 0; i++) {
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unsigned long top;
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if (sp_banks[i].base_addr < phys_base)
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phys_base = sp_banks[i].base_addr;
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top = sp_banks[i].base_addr +
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sp_banks[i].num_bytes;
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if (highest_paddr < top)
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highest_paddr = top;
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}
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pfn_base = phys_base >> PAGE_SHIFT;
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if (!root_flags)
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root_mountflags &= ~MS_RDONLY;
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ROOT_DEV = old_decode_dev(root_dev);
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#ifdef CONFIG_BLK_DEV_RAM
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rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
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rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
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rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);
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#endif
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prom_setsync(prom_sync_me);
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if((boot_flags & BOOTME_DEBUG) && (linux_dbvec != NULL) &&
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((*(short *)linux_dbvec) != -1)) {
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printk("Booted under KADB. Syncing trap table.\n");
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(*(linux_dbvec->teach_debugger))();
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}
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init_task.thread.kregs = &fake_swapper_regs;
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/* Run-time patch instructions to match the cpu model */
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per_cpu_patch();
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paging_init();
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smp_setup_cpu_possible_map();
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}
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extern int stop_a_enabled;
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void sun_do_break(void)
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{
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if (!stop_a_enabled)
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return;
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printk("\n");
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flush_user_windows();
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prom_cmdline();
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}
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EXPORT_SYMBOL(sun_do_break);
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int stop_a_enabled = 1;
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static int __init topology_init(void)
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{
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int i, ncpus, err;
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/* Count the number of physically present processors in
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* the machine, even on uniprocessor, so that /proc/cpuinfo
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* output is consistent with 2.4.x
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*/
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ncpus = 0;
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while (!cpu_find_by_instance(ncpus, NULL, NULL))
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ncpus++;
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ncpus_probed = ncpus;
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err = 0;
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for_each_online_cpu(i) {
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struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL);
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if (!p)
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err = -ENOMEM;
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else
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register_cpu(p, i);
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}
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return err;
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}
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subsys_initcall(topology_init);
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