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linux/arch/sparc/kernel/setup_32.c
Al Viro af7652500b sparc32: get rid of fake_swapper_regs 
no reason to have ->kregs of initial thread set up in a special
way - we can keep them on stack, same as for every other thread.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2021-01-03 20:10:55 -05:00

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