arch/sparc/kernel/setup_32.c - linux - Git at Google

 // 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();
 	strscpy(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);

 #if defined(CONFIG_SPARC32) && !defined(CONFIG_SMP)
 void __init arch_cpu_finalize_init(void)
 {
 	cpu_data(0).udelay_val = loops_per_jiffy;
 }
 #endif
	// 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();
	strscpy(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);

	#if defined(CONFIG_SPARC32) && !defined(CONFIG_SMP)
	void __init arch_cpu_finalize_init(void)
	{
	cpu_data(0).udelay_val = loops_per_jiffy;
	}
	#endif