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09d3f3f0e0
Many years ago when this driver was written, it had a use, but these days it's nothing but trouble and distributions should not enable it in any situation. Pretty much every console device a sparc machine could see has a bonafide real driver, making the PROM console hack unnecessary. If any new device shows up, we should write a driver instead of depending upon this crutch to save us. We've been able to take care of this even when no chip documentation exists (sunxvr500, sunxvr2500) so there are no excuses. Signed-off-by: David S. Miller <davem@davemloft.net>
429 lines
9.2 KiB
C
429 lines
9.2 KiB
C
/*
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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 <asm/system.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/machines.h>
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#include <asm/cpudata.h>
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#include <asm/setup.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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extern unsigned long trapbase;
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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();
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if(current->pid != 0) {
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local_irq_enable();
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sys_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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return;
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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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static void
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prom_console_write(struct console *con, const char *s, unsigned 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_debug_console = {
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.name = "debug",
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.write = prom_console_write,
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.flags = CON_PRINTBUFFER,
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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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/* Use PROM debug console. */
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register_console(&prom_debug_console);
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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 && *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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/* This routine will in the future do all the nasty prom stuff
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* to probe for the mmu type and its parameters, etc. This will
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* also be where SMP things happen.
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*/
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extern void sun4c_probe_vac(void);
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extern char cputypval;
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extern unsigned long start, end;
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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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enum sparc_cpu sparc_cpu_model;
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EXPORT_SYMBOL(sparc_cpu_model);
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struct tt_entry *sparc_ttable;
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struct pt_regs fake_swapper_regs;
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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 = (struct tt_entry *) &start;
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/* Initialize PROM console and command line. */
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*cmdline_p = prom_getbootargs();
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strcpy(boot_command_line, *cmdline_p);
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parse_early_param();
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/* Set sparc_cpu_model */
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sparc_cpu_model = sun_unknown;
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if (!strcmp(&cputypval,"sun4 "))
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sparc_cpu_model = sun4;
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if (!strcmp(&cputypval,"sun4c"))
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sparc_cpu_model = sun4c;
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if (!strcmp(&cputypval,"sun4m"))
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sparc_cpu_model = sun4m;
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if (!strcmp(&cputypval,"sun4s"))
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sparc_cpu_model = sun4m; /* CP-1200 with PROM 2.30 -E */
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if (!strcmp(&cputypval,"sun4d"))
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sparc_cpu_model = sun4d;
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if (!strcmp(&cputypval,"sun4e"))
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sparc_cpu_model = sun4e;
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if (!strcmp(&cputypval,"sun4u"))
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sparc_cpu_model = sun4u;
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if (!strncmp(&cputypval, "leon" , 4))
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sparc_cpu_model = sparc_leon;
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printk("ARCH: ");
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switch(sparc_cpu_model) {
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case sun4:
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printk("SUN4\n");
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break;
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case sun4c:
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printk("SUN4C\n");
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break;
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case sun4m:
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printk("SUN4M\n");
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break;
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case sun4d:
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printk("SUN4D\n");
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break;
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case sun4e:
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printk("SUN4E\n");
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break;
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case sun4u:
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printk("SUN4U\n");
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break;
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case sparc_leon:
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printk("LEON\n");
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break;
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default:
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printk("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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boot_flags_init(*cmdline_p);
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idprom_init();
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if (ARCH_SUN4C)
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sun4c_probe_vac();
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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!=0) &&
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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_mm.context = (unsigned long) NO_CONTEXT;
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init_task.thread.kregs = &fake_swapper_regs;
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paging_init();
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smp_setup_cpu_possible_map();
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}
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static int ncpus_probed;
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static int show_cpuinfo(struct seq_file *m, void *__unused)
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{
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seq_printf(m,
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"cpu\t\t: %s\n"
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"fpu\t\t: %s\n"
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"promlib\t\t: Version %d Revision %d\n"
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"prom\t\t: %d.%d\n"
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"type\t\t: %s\n"
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"ncpus probed\t: %d\n"
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"ncpus active\t: %d\n"
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#ifndef CONFIG_SMP
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"CPU0Bogo\t: %lu.%02lu\n"
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"CPU0ClkTck\t: %ld\n"
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#endif
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,
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sparc_cpu_type,
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sparc_fpu_type ,
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romvec->pv_romvers,
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prom_rev,
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romvec->pv_printrev >> 16,
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romvec->pv_printrev & 0xffff,
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&cputypval,
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ncpus_probed,
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num_online_cpus()
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#ifndef CONFIG_SMP
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, cpu_data(0).udelay_val/(500000/HZ),
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(cpu_data(0).udelay_val/(5000/HZ)) % 100,
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cpu_data(0).clock_tick
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#endif
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);
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#ifdef CONFIG_SMP
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smp_bogo(m);
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#endif
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mmu_info(m);
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#ifdef CONFIG_SMP
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smp_info(m);
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#endif
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return 0;
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}
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static void *c_start(struct seq_file *m, loff_t *pos)
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{
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/* The pointer we are returning is arbitrary,
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* it just has to be non-NULL and not IS_ERR
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* in the success case.
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*/
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return *pos == 0 ? &c_start : NULL;
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}
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static void *c_next(struct seq_file *m, void *v, loff_t *pos)
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{
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++*pos;
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return c_start(m, pos);
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}
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static void c_stop(struct seq_file *m, void *v)
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{
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}
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const struct seq_operations cpuinfo_op = {
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.start =c_start,
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.next = c_next,
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.stop = c_stop,
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.show = show_cpuinfo,
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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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