arch/sparc/kernel/setup_64.c - third_party/linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  *  linux/arch/sparc64/kernel/setup.c
  *
  *  Copyright (C) 1995,1996  David S. Miller (davem@caip.rutgers.edu)
  *  Copyright (C) 1997       Jakub Jelinek (jj@sunsite.mff.cuni.cz)
  */

 #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 <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/inet.h>
 #include <linux/console.h>
 #include <linux/root_dev.h>
 #include <linux/interrupt.h>
 #include <linux/cpu.h>
 #include <linux/initrd.h>
 #include <linux/module.h>
 #include <linux/start_kernel.h>
 #include <linux/bootmem.h>

 #include <asm/io.h>
 #include <asm/processor.h>
 #include <asm/oplib.h>
 #include <asm/page.h>
 #include <asm/pgtable.h>
 #include <asm/idprom.h>
 #include <asm/head.h>
 #include <asm/starfire.h>
 #include <asm/mmu_context.h>
 #include <asm/timer.h>
 #include <asm/sections.h>
 #include <asm/setup.h>
 #include <asm/mmu.h>
 #include <asm/ns87303.h>
 #include <asm/btext.h>
 #include <asm/elf.h>
 #include <asm/mdesc.h>
 #include <asm/cacheflush.h>
 #include <asm/dma.h>
 #include <asm/irq.h>

 #ifdef CONFIG_IP_PNP
 #include <net/ipconfig.h>
 #endif

 #include "entry.h"
 #include "kernel.h"

 /* Used to synchronize accesses to NatSemi SUPER I/O chip configure
  * operations in asm/ns87303.h
  */
 DEFINE_SPINLOCK(ns87303_lock);
 EXPORT_SYMBOL(ns87303_lock);

 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,		/* unused, ega_bx, unused */
 	54,			/* orig-video-lines */
 	0,                      /* orig-video-isVGA */
 	16                      /* orig-video-points */
 };

 static void
 prom_console_write(struct console *con, const char *s, unsigned int n)
 {
 	prom_write(s, n);
 }

 /* Exported for mm/init.c:paging_init. */
 unsigned long cmdline_memory_size = 0;

 static struct console prom_early_console = {
 	.name =		"earlyprom",
 	.write =	prom_console_write,
 	.flags =	CON_PRINTBUFFER | CON_BOOT | CON_ANYTIME,
 	.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':
 	case 's':
 		break;
 	case 'h':
 		prom_printf("boot_flags_init: Halt!\n");
 		prom_halt();
 		break;
 	case 'p':
 		prom_early_console.flags &= ~CON_BOOT;
 		break;
 	case 'P':
 		/* Force UltraSPARC-III P-Cache on. */
 		if (tlb_type != cheetah) {
 			printk("BOOT: Ignoring P-Cache force option.\n");
 			break;
 		}
 		cheetah_pcache_forced_on = 1;
 		add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE);
 		cheetah_enable_pcache();
 		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))
 			cmdline_memory_size = memparse(commands + 4, &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];

 static struct pt_regs fake_swapper_regs = { { 0, }, 0, 0, 0, 0 };

 static void __init per_cpu_patch(void)
 {
 	struct cpuid_patch_entry *p;
 	unsigned long ver;
 	int is_jbus;

 	if (tlb_type == spitfire && !this_is_starfire)
 		return;

 	is_jbus = 0;
 	if (tlb_type != hypervisor) {
 		__asm__ ("rdpr %%ver, %0" : "=r" (ver));
 		is_jbus = ((ver >> 32UL) == __JALAPENO_ID ||
 			   (ver >> 32UL) == __SERRANO_ID);
 	}

 	p = &__cpuid_patch;
 	while (p < &__cpuid_patch_end) {
 		unsigned long addr = p->addr;
 		unsigned int *insns;

 		switch (tlb_type) {
 		case spitfire:
 			insns = &p->starfire[0];
 			break;
 		case cheetah:
 		case cheetah_plus:
 			if (is_jbus)
 				insns = &p->cheetah_jbus[0];
 			else
 				insns = &p->cheetah_safari[0];
 			break;
 		case hypervisor:
 			insns = &p->sun4v[0];
 			break;
 		default:
 			prom_printf("Unknown cpu type, halting.\n");
 			prom_halt();
 		}

 		*(unsigned int *) (addr +  0) = insns[0];
 		wmb();
 		__asm__ __volatile__("flush	%0" : : "r" (addr +  0));

 		*(unsigned int *) (addr +  4) = insns[1];
 		wmb();
 		__asm__ __volatile__("flush	%0" : : "r" (addr +  4));

 		*(unsigned int *) (addr +  8) = insns[2];
 		wmb();
 		__asm__ __volatile__("flush	%0" : : "r" (addr +  8));

 		*(unsigned int *) (addr + 12) = insns[3];
 		wmb();
 		__asm__ __volatile__("flush	%0" : : "r" (addr + 12));

 		p++;
 	}
 }

 void sun4v_patch_1insn_range(struct sun4v_1insn_patch_entry *start,
 			     struct sun4v_1insn_patch_entry *end)
 {
 	while (start < end) {
 		unsigned long addr = start->addr;

 		*(unsigned int *) (addr +  0) = start->insn;
 		wmb();
 		__asm__ __volatile__("flush	%0" : : "r" (addr +  0));

 		start++;
 	}
 }

 void sun4v_patch_2insn_range(struct sun4v_2insn_patch_entry *start,
 			     struct sun4v_2insn_patch_entry *end)
 {
 	while (start < end) {
 		unsigned long addr = start->addr;

 		*(unsigned int *) (addr +  0) = start->insns[0];
 		wmb();
 		__asm__ __volatile__("flush	%0" : : "r" (addr +  0));

 		*(unsigned int *) (addr +  4) = start->insns[1];
 		wmb();
 		__asm__ __volatile__("flush	%0" : : "r" (addr +  4));

 		start++;
 	}
 }

 void sun_m7_patch_2insn_range(struct sun4v_2insn_patch_entry *start,
 			     struct sun4v_2insn_patch_entry *end)
 {
 	while (start < end) {
 		unsigned long addr = start->addr;

 		*(unsigned int *) (addr +  0) = start->insns[0];
 		wmb();
 		__asm__ __volatile__("flush	%0" : : "r" (addr +  0));

 		*(unsigned int *) (addr +  4) = start->insns[1];
 		wmb();
 		__asm__ __volatile__("flush	%0" : : "r" (addr +  4));

 		start++;
 	}
 }

 static void __init sun4v_patch(void)
 {
 	extern void sun4v_hvapi_init(void);

 	if (tlb_type != hypervisor)
 		return;

 	sun4v_patch_1insn_range(&__sun4v_1insn_patch,
 				&__sun4v_1insn_patch_end);

 	sun4v_patch_2insn_range(&__sun4v_2insn_patch,
 				&__sun4v_2insn_patch_end);

 	switch (sun4v_chip_type) {
 	case SUN4V_CHIP_SPARC_M7:
 	case SUN4V_CHIP_SPARC_M8:
 	case SUN4V_CHIP_SPARC_SN:
 		sun4v_patch_1insn_range(&__sun_m7_1insn_patch,
 					&__sun_m7_1insn_patch_end);
 		sun_m7_patch_2insn_range(&__sun_m7_2insn_patch,
 					 &__sun_m7_2insn_patch_end);
 		break;
 	default:
 		break;
 	}

 	if (sun4v_chip_type != SUN4V_CHIP_NIAGARA1) {
 		sun4v_patch_1insn_range(&__fast_win_ctrl_1insn_patch,
 					&__fast_win_ctrl_1insn_patch_end);
 	}

 	sun4v_hvapi_init();
 }

 static void __init popc_patch(void)
 {
 	struct popc_3insn_patch_entry *p3;
 	struct popc_6insn_patch_entry *p6;

 	p3 = &__popc_3insn_patch;
 	while (p3 < &__popc_3insn_patch_end) {
 		unsigned long i, addr = p3->addr;

 		for (i = 0; i < 3; i++) {
 			*(unsigned int *) (addr +  (i * 4)) = p3->insns[i];
 			wmb();
 			__asm__ __volatile__("flush	%0"
 					     : : "r" (addr +  (i * 4)));
 		}

 		p3++;
 	}

 	p6 = &__popc_6insn_patch;
 	while (p6 < &__popc_6insn_patch_end) {
 		unsigned long i, addr = p6->addr;

 		for (i = 0; i < 6; i++) {
 			*(unsigned int *) (addr +  (i * 4)) = p6->insns[i];
 			wmb();
 			__asm__ __volatile__("flush	%0"
 					     : : "r" (addr +  (i * 4)));
 		}

 		p6++;
 	}
 }

 static void __init pause_patch(void)
 {
 	struct pause_patch_entry *p;

 	p = &__pause_3insn_patch;
 	while (p < &__pause_3insn_patch_end) {
 		unsigned long i, addr = p->addr;

 		for (i = 0; i < 3; i++) {
 			*(unsigned int *) (addr +  (i * 4)) = p->insns[i];
 			wmb();
 			__asm__ __volatile__("flush	%0"
 					     : : "r" (addr +  (i * 4)));
 		}

 		p++;
 	}
 }

 void __init start_early_boot(void)
 {
 	int cpu;

 	check_if_starfire();
 	per_cpu_patch();
 	sun4v_patch();
 	smp_init_cpu_poke();

 	cpu = hard_smp_processor_id();
 	if (cpu >= NR_CPUS) {
 		prom_printf("Serious problem, boot cpu id (%d) >= NR_CPUS (%d)\n",
 			    cpu, NR_CPUS);
 		prom_halt();
 	}
 	current_thread_info()->cpu = cpu;

 	time_init_early();
 	prom_init_report();
 	start_kernel();
 }

 /* On Ultra, we support all of the v8 capabilities. */
 unsigned long sparc64_elf_hwcap = (HWCAP_SPARC_FLUSH | HWCAP_SPARC_STBAR |
 				   HWCAP_SPARC_SWAP | HWCAP_SPARC_MULDIV |
 				   HWCAP_SPARC_V9);
 EXPORT_SYMBOL(sparc64_elf_hwcap);

 static const char *hwcaps[] = {
 	"flush", "stbar", "swap", "muldiv", "v9",
 	"ultra3", "blkinit", "n2",

 	/* These strings are as they appear in the machine description
 	 * 'hwcap-list' property for cpu nodes.
 	 */
 	"mul32", "div32", "fsmuld", "v8plus", "popc", "vis", "vis2",
 	"ASIBlkInit", "fmaf", "vis3", "hpc", "random", "trans", "fjfmau",
 	"ima", "cspare", "pause", "cbcond", NULL /*reserved for crypto */,
 	"adp",
 };

 static const char *crypto_hwcaps[] = {
 	"aes", "des", "kasumi", "camellia", "md5", "sha1", "sha256",
 	"sha512", "mpmul", "montmul", "montsqr", "crc32c",
 };

 void cpucap_info(struct seq_file *m)
 {
 	unsigned long caps = sparc64_elf_hwcap;
 	int i, printed = 0;

 	seq_puts(m, "cpucaps\t\t: ");
 	for (i = 0; i < ARRAY_SIZE(hwcaps); i++) {
 		unsigned long bit = 1UL << i;
 		if (hwcaps[i] && (caps & bit)) {
 			seq_printf(m, "%s%s",
 				   printed ? "," : "", hwcaps[i]);
 			printed++;
 		}
 	}
 	if (caps & HWCAP_SPARC_CRYPTO) {
 		unsigned long cfr;

 		__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
 		for (i = 0; i < ARRAY_SIZE(crypto_hwcaps); i++) {
 			unsigned long bit = 1UL << i;
 			if (cfr & bit) {
 				seq_printf(m, "%s%s",
 					   printed ? "," : "", crypto_hwcaps[i]);
 				printed++;
 			}
 		}
 	}
 	seq_putc(m, '\n');
 }

 static void __init report_one_hwcap(int *printed, const char *name)
 {
 	if ((*printed) == 0)
 		printk(KERN_INFO "CPU CAPS: [");
 	printk(KERN_CONT "%s%s",
 	       (*printed) ? "," : "", name);
 	if (++(*printed) == 8) {
 		printk(KERN_CONT "]\n");
 		*printed = 0;
 	}
 }

 static void __init report_crypto_hwcaps(int *printed)
 {
 	unsigned long cfr;
 	int i;

 	__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));

 	for (i = 0; i < ARRAY_SIZE(crypto_hwcaps); i++) {
 		unsigned long bit = 1UL << i;
 		if (cfr & bit)
 			report_one_hwcap(printed, crypto_hwcaps[i]);
 	}
 }

 static void __init report_hwcaps(unsigned long caps)
 {
 	int i, printed = 0;

 	for (i = 0; i < ARRAY_SIZE(hwcaps); i++) {
 		unsigned long bit = 1UL << i;
 		if (hwcaps[i] && (caps & bit))
 			report_one_hwcap(&printed, hwcaps[i]);
 	}
 	if (caps & HWCAP_SPARC_CRYPTO)
 		report_crypto_hwcaps(&printed);
 	if (printed != 0)
 		printk(KERN_CONT "]\n");
 }

 static unsigned long __init mdesc_cpu_hwcap_list(void)
 {
 	struct mdesc_handle *hp;
 	unsigned long caps = 0;
 	const char *prop;
 	int len;
 	u64 pn;

 	hp = mdesc_grab();
 	if (!hp)
 		return 0;

 	pn = mdesc_node_by_name(hp, MDESC_NODE_NULL, "cpu");
 	if (pn == MDESC_NODE_NULL)
 		goto out;

 	prop = mdesc_get_property(hp, pn, "hwcap-list", &len);
 	if (!prop)
 		goto out;

 	while (len) {
 		int i, plen;

 		for (i = 0; i < ARRAY_SIZE(hwcaps); i++) {
 			unsigned long bit = 1UL << i;

 			if (hwcaps[i] && !strcmp(prop, hwcaps[i])) {
 				caps |= bit;
 				break;
 			}
 		}
 		for (i = 0; i < ARRAY_SIZE(crypto_hwcaps); i++) {
 			if (!strcmp(prop, crypto_hwcaps[i]))
 				caps |= HWCAP_SPARC_CRYPTO;
 		}

 		plen = strlen(prop) + 1;
 		prop += plen;
 		len -= plen;
 	}

 out:
 	mdesc_release(hp);
 	return caps;
 }

 /* This yields a mask that user programs can use to figure out what
  * instruction set this cpu supports.
  */
 static void __init init_sparc64_elf_hwcap(void)
 {
 	unsigned long cap = sparc64_elf_hwcap;
 	unsigned long mdesc_caps;

 	if (tlb_type == cheetah || tlb_type == cheetah_plus)
 		cap |= HWCAP_SPARC_ULTRA3;
 	else if (tlb_type == hypervisor) {
 		if (sun4v_chip_type == SUN4V_CHIP_NIAGARA1 ||
 		    sun4v_chip_type == SUN4V_CHIP_NIAGARA2 ||
 		    sun4v_chip_type == SUN4V_CHIP_NIAGARA3 ||
 		    sun4v_chip_type == SUN4V_CHIP_NIAGARA4 ||
 		    sun4v_chip_type == SUN4V_CHIP_NIAGARA5 ||
 		    sun4v_chip_type == SUN4V_CHIP_SPARC_M6 ||
 		    sun4v_chip_type == SUN4V_CHIP_SPARC_M7 ||
 		    sun4v_chip_type == SUN4V_CHIP_SPARC_M8 ||
 		    sun4v_chip_type == SUN4V_CHIP_SPARC_SN ||
 		    sun4v_chip_type == SUN4V_CHIP_SPARC64X)
 			cap |= HWCAP_SPARC_BLKINIT;
 		if (sun4v_chip_type == SUN4V_CHIP_NIAGARA2 ||
 		    sun4v_chip_type == SUN4V_CHIP_NIAGARA3 ||
 		    sun4v_chip_type == SUN4V_CHIP_NIAGARA4 ||
 		    sun4v_chip_type == SUN4V_CHIP_NIAGARA5 ||
 		    sun4v_chip_type == SUN4V_CHIP_SPARC_M6 ||
 		    sun4v_chip_type == SUN4V_CHIP_SPARC_M7 ||
 		    sun4v_chip_type == SUN4V_CHIP_SPARC_M8 ||
 		    sun4v_chip_type == SUN4V_CHIP_SPARC_SN ||
 		    sun4v_chip_type == SUN4V_CHIP_SPARC64X)
 			cap |= HWCAP_SPARC_N2;
 	}

 	cap |= (AV_SPARC_MUL32 | AV_SPARC_DIV32 | AV_SPARC_V8PLUS);

 	mdesc_caps = mdesc_cpu_hwcap_list();
 	if (!mdesc_caps) {
 		if (tlb_type == spitfire)
 			cap |= AV_SPARC_VIS;
 		if (tlb_type == cheetah || tlb_type == cheetah_plus)
 			cap |= AV_SPARC_VIS | AV_SPARC_VIS2;
 		if (tlb_type == cheetah_plus) {
 			unsigned long impl, ver;

 			__asm__ __volatile__("rdpr %%ver, %0" : "=r" (ver));
 			impl = ((ver >> 32) & 0xffff);
 			if (impl == PANTHER_IMPL)
 				cap |= AV_SPARC_POPC;
 		}
 		if (tlb_type == hypervisor) {
 			if (sun4v_chip_type == SUN4V_CHIP_NIAGARA1)
 				cap |= AV_SPARC_ASI_BLK_INIT;
 			if (sun4v_chip_type == SUN4V_CHIP_NIAGARA2 ||
 			    sun4v_chip_type == SUN4V_CHIP_NIAGARA3 ||
 			    sun4v_chip_type == SUN4V_CHIP_NIAGARA4 ||
 			    sun4v_chip_type == SUN4V_CHIP_NIAGARA5 ||
 			    sun4v_chip_type == SUN4V_CHIP_SPARC_M6 ||
 			    sun4v_chip_type == SUN4V_CHIP_SPARC_M7 ||
 			    sun4v_chip_type == SUN4V_CHIP_SPARC_M8 ||
 			    sun4v_chip_type == SUN4V_CHIP_SPARC_SN ||
 			    sun4v_chip_type == SUN4V_CHIP_SPARC64X)
 				cap |= (AV_SPARC_VIS | AV_SPARC_VIS2 |
 					AV_SPARC_ASI_BLK_INIT |
 					AV_SPARC_POPC);
 			if (sun4v_chip_type == SUN4V_CHIP_NIAGARA3 ||
 			    sun4v_chip_type == SUN4V_CHIP_NIAGARA4 ||
 			    sun4v_chip_type == SUN4V_CHIP_NIAGARA5 ||
 			    sun4v_chip_type == SUN4V_CHIP_SPARC_M6 ||
 			    sun4v_chip_type == SUN4V_CHIP_SPARC_M7 ||
 			    sun4v_chip_type == SUN4V_CHIP_SPARC_M8 ||
 			    sun4v_chip_type == SUN4V_CHIP_SPARC_SN ||
 			    sun4v_chip_type == SUN4V_CHIP_SPARC64X)
 				cap |= (AV_SPARC_VIS3 | AV_SPARC_HPC |
 					AV_SPARC_FMAF);
 		}
 	}
 	sparc64_elf_hwcap = cap | mdesc_caps;

 	report_hwcaps(sparc64_elf_hwcap);

 	if (sparc64_elf_hwcap & AV_SPARC_POPC)
 		popc_patch();
 	if (sparc64_elf_hwcap & AV_SPARC_PAUSE)
 		pause_patch();
 }

 void __init alloc_irqstack_bootmem(void)
 {
 	unsigned int i, node;

 	for_each_possible_cpu(i) {
 		node = cpu_to_node(i);

 		softirq_stack[i] = __alloc_bootmem_node(NODE_DATA(node),
 							THREAD_SIZE,
 							THREAD_SIZE, 0);
 		hardirq_stack[i] = __alloc_bootmem_node(NODE_DATA(node),
 							THREAD_SIZE,
 							THREAD_SIZE, 0);
 	}
 }

 void __init setup_arch(char **cmdline_p)
 {
 	/* 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);
 #ifdef CONFIG_EARLYFB
 	if (btext_find_display())
 #endif
 		register_console(&prom_early_console);

 	if (tlb_type == hypervisor)
 		printk("ARCH: SUN4V\n");
 	else
 		printk("ARCH: SUN4U\n");

 #ifdef CONFIG_DUMMY_CONSOLE
 	conswitchp = &dummy_con;
 #endif

 	idprom_init();

 	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;
 	rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
 	rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);
 #endif

 	task_thread_info(&init_task)->kregs = &fake_swapper_regs;

 #ifdef CONFIG_IP_PNP
 	if (!ic_set_manually) {
 		phandle chosen = prom_finddevice("/chosen");
 		u32 cl, sv, gw;

 		cl = prom_getintdefault (chosen, "client-ip", 0);
 		sv = prom_getintdefault (chosen, "server-ip", 0);
 		gw = prom_getintdefault (chosen, "gateway-ip", 0);
 		if (cl && sv) {
 			ic_myaddr = cl;
 			ic_servaddr = sv;
 			if (gw)
 				ic_gateway = gw;
 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_RARP)
 			ic_proto_enabled = 0;
 #endif
 		}
 	}
 #endif

 	/* Get boot processor trap_block[] setup.  */
 	init_cur_cpu_trap(current_thread_info());

 	paging_init();
 	init_sparc64_elf_hwcap();
 	smp_fill_in_cpu_possible_map();
 	/*
 	 * Once the OF device tree and MDESC have been setup and nr_cpus has
 	 * been parsed, we know the list of possible cpus.  Therefore we can
 	 * allocate the IRQ stacks.
 	 */
 	alloc_irqstack_bootmem();
 }

 extern int stop_a_enabled;

 void sun_do_break(void)
 {
 	if (!stop_a_enabled)
 		return;

 	prom_printf("\n");
 	flush_user_windows();

 	prom_cmdline();
 }
 EXPORT_SYMBOL(sun_do_break);

 int stop_a_enabled = 1;
 EXPORT_SYMBOL(stop_a_enabled);
	// SPDX-License-Identifier: GPL-2.0
	/*
	* linux/arch/sparc64/kernel/setup.c
	*
	* Copyright (C) 1995,1996 David S. Miller (davem@caip.rutgers.edu)
	* Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
	*/

	#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 <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/inet.h>
	#include <linux/console.h>
	#include <linux/root_dev.h>
	#include <linux/interrupt.h>
	#include <linux/cpu.h>
	#include <linux/initrd.h>
	#include <linux/module.h>
	#include <linux/start_kernel.h>
	#include <linux/bootmem.h>

	#include <asm/io.h>
	#include <asm/processor.h>
	#include <asm/oplib.h>
	#include <asm/page.h>
	#include <asm/pgtable.h>
	#include <asm/idprom.h>
	#include <asm/head.h>
	#include <asm/starfire.h>
	#include <asm/mmu_context.h>
	#include <asm/timer.h>
	#include <asm/sections.h>
	#include <asm/setup.h>
	#include <asm/mmu.h>
	#include <asm/ns87303.h>
	#include <asm/btext.h>
	#include <asm/elf.h>
	#include <asm/mdesc.h>
	#include <asm/cacheflush.h>
	#include <asm/dma.h>
	#include <asm/irq.h>

	#ifdef CONFIG_IP_PNP
	#include <net/ipconfig.h>
	#endif

	#include "entry.h"
	#include "kernel.h"

	/* Used to synchronize accesses to NatSemi SUPER I/O chip configure
	* operations in asm/ns87303.h
	*/
	DEFINE_SPINLOCK(ns87303_lock);
	EXPORT_SYMBOL(ns87303_lock);

	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, /* unused, ega_bx, unused */
	54, /* orig-video-lines */
	0, /* orig-video-isVGA */
	16 /* orig-video-points */
	};

	static void
	prom_console_write(struct console con, const char s, unsigned int n)
	{
	prom_write(s, n);
	}

	/* Exported for mm/init.c:paging_init. */
	unsigned long cmdline_memory_size = 0;

	static struct console prom_early_console = {
	.name = "earlyprom",
	.write = prom_console_write,
	.flags = CON_PRINTBUFFER \| CON_BOOT \| CON_ANYTIME,
	.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':
	case 's':
	break;
	case 'h':
	prom_printf("boot_flags_init: Halt!\n");
	prom_halt();
	break;
	case 'p':
	prom_early_console.flags &= ~CON_BOOT;
	break;
	case 'P':
	/* Force UltraSPARC-III P-Cache on. */
	if (tlb_type != cheetah) {
	printk("BOOT: Ignoring P-Cache force option.\n");
	break;
	}
	cheetah_pcache_forced_on = 1;
	add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE);
	cheetah_enable_pcache();
	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))
	cmdline_memory_size = memparse(commands + 4, &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];

	static struct pt_regs fake_swapper_regs = { { 0, }, 0, 0, 0, 0 };

	static void __init per_cpu_patch(void)
	{
	struct cpuid_patch_entry *p;
	unsigned long ver;
	int is_jbus;

	if (tlb_type == spitfire && !this_is_starfire)
	return;

	is_jbus = 0;
	if (tlb_type != hypervisor) {
	__asm__ ("rdpr %%ver, %0" : "=r" (ver));
	is_jbus = ((ver >> 32UL) == __JALAPENO_ID \|\|
	(ver >> 32UL) == __SERRANO_ID);
	}

	p = &__cpuid_patch;
	while (p < &__cpuid_patch_end) {
	unsigned long addr = p->addr;
	unsigned int *insns;

	switch (tlb_type) {
	case spitfire:
	insns = &p->starfire[0];
	break;
	case cheetah:
	case cheetah_plus:
	if (is_jbus)
	insns = &p->cheetah_jbus[0];
	else
	insns = &p->cheetah_safari[0];
	break;
	case hypervisor:
	insns = &p->sun4v[0];
	break;
	default:
	prom_printf("Unknown cpu type, halting.\n");
	prom_halt();
	}

	(unsigned int ) (addr + 0) = insns[0];
	wmb();
	__asm__ __volatile__("flush %0" : : "r" (addr + 0));

	(unsigned int ) (addr + 4) = insns[1];
	wmb();
	__asm__ __volatile__("flush %0" : : "r" (addr + 4));

	(unsigned int ) (addr + 8) = insns[2];
	wmb();
	__asm__ __volatile__("flush %0" : : "r" (addr + 8));

	(unsigned int ) (addr + 12) = insns[3];
	wmb();
	__asm__ __volatile__("flush %0" : : "r" (addr + 12));

	p++;
	}
	}

	void sun4v_patch_1insn_range(struct sun4v_1insn_patch_entry *start,
	struct sun4v_1insn_patch_entry *end)
	{
	while (start < end) {
	unsigned long addr = start->addr;

	(unsigned int ) (addr + 0) = start->insn;
	wmb();
	__asm__ __volatile__("flush %0" : : "r" (addr + 0));

	start++;
	}
	}

	void sun4v_patch_2insn_range(struct sun4v_2insn_patch_entry *start,
	struct sun4v_2insn_patch_entry *end)
	{
	while (start < end) {
	unsigned long addr = start->addr;

	(unsigned int ) (addr + 0) = start->insns[0];
	wmb();
	__asm__ __volatile__("flush %0" : : "r" (addr + 0));

	(unsigned int ) (addr + 4) = start->insns[1];
	wmb();
	__asm__ __volatile__("flush %0" : : "r" (addr + 4));

	start++;
	}
	}

	void sun_m7_patch_2insn_range(struct sun4v_2insn_patch_entry *start,
	struct sun4v_2insn_patch_entry *end)
	{
	while (start < end) {
	unsigned long addr = start->addr;

	(unsigned int ) (addr + 0) = start->insns[0];
	wmb();
	__asm__ __volatile__("flush %0" : : "r" (addr + 0));

	(unsigned int ) (addr + 4) = start->insns[1];
	wmb();
	__asm__ __volatile__("flush %0" : : "r" (addr + 4));

	start++;
	}
	}

	static void __init sun4v_patch(void)
	{
	extern void sun4v_hvapi_init(void);

	if (tlb_type != hypervisor)
	return;

	sun4v_patch_1insn_range(&__sun4v_1insn_patch,
	&__sun4v_1insn_patch_end);

	sun4v_patch_2insn_range(&__sun4v_2insn_patch,
	&__sun4v_2insn_patch_end);

	switch (sun4v_chip_type) {
	case SUN4V_CHIP_SPARC_M7:
	case SUN4V_CHIP_SPARC_M8:
	case SUN4V_CHIP_SPARC_SN:
	sun4v_patch_1insn_range(&__sun_m7_1insn_patch,
	&__sun_m7_1insn_patch_end);
	sun_m7_patch_2insn_range(&__sun_m7_2insn_patch,
	&__sun_m7_2insn_patch_end);
	break;
	default:
	break;
	}

	if (sun4v_chip_type != SUN4V_CHIP_NIAGARA1) {
	sun4v_patch_1insn_range(&__fast_win_ctrl_1insn_patch,
	&__fast_win_ctrl_1insn_patch_end);
	}

	sun4v_hvapi_init();
	}

	static void __init popc_patch(void)
	{
	struct popc_3insn_patch_entry *p3;
	struct popc_6insn_patch_entry *p6;

	p3 = &__popc_3insn_patch;
	while (p3 < &__popc_3insn_patch_end) {
	unsigned long i, addr = p3->addr;

	for (i = 0; i < 3; i++) {
	(unsigned int ) (addr + (i * 4)) = p3->insns[i];
	wmb();
	__asm__ __volatile__("flush %0"
	: : "r" (addr + (i * 4)));
	}

	p3++;
	}

	p6 = &__popc_6insn_patch;
	while (p6 < &__popc_6insn_patch_end) {
	unsigned long i, addr = p6->addr;

	for (i = 0; i < 6; i++) {
	(unsigned int ) (addr + (i * 4)) = p6->insns[i];
	wmb();
	__asm__ __volatile__("flush %0"
	: : "r" (addr + (i * 4)));
	}

	p6++;
	}
	}

	static void __init pause_patch(void)
	{
	struct pause_patch_entry *p;

	p = &__pause_3insn_patch;
	while (p < &__pause_3insn_patch_end) {
	unsigned long i, addr = p->addr;

	for (i = 0; i < 3; i++) {
	(unsigned int ) (addr + (i * 4)) = p->insns[i];
	wmb();
	__asm__ __volatile__("flush %0"
	: : "r" (addr + (i * 4)));
	}

	p++;
	}
	}

	void __init start_early_boot(void)
	{
	int cpu;

	check_if_starfire();
	per_cpu_patch();
	sun4v_patch();
	smp_init_cpu_poke();

	cpu = hard_smp_processor_id();
	if (cpu >= NR_CPUS) {
	prom_printf("Serious problem, boot cpu id (%d) >= NR_CPUS (%d)\n",
	cpu, NR_CPUS);
	prom_halt();
	}
	current_thread_info()->cpu = cpu;

	time_init_early();
	prom_init_report();
	start_kernel();
	}

	/* On Ultra, we support all of the v8 capabilities. */
	unsigned long sparc64_elf_hwcap = (HWCAP_SPARC_FLUSH \| HWCAP_SPARC_STBAR \|
	HWCAP_SPARC_SWAP \| HWCAP_SPARC_MULDIV \|
	HWCAP_SPARC_V9);
	EXPORT_SYMBOL(sparc64_elf_hwcap);

	static const char *hwcaps[] = {
	"flush", "stbar", "swap", "muldiv", "v9",
	"ultra3", "blkinit", "n2",

	/* These strings are as they appear in the machine description
	* 'hwcap-list' property for cpu nodes.
	*/
	"mul32", "div32", "fsmuld", "v8plus", "popc", "vis", "vis2",
	"ASIBlkInit", "fmaf", "vis3", "hpc", "random", "trans", "fjfmau",
	"ima", "cspare", "pause", "cbcond", NULL /reserved for crypto /,
	"adp",
	};

	static const char *crypto_hwcaps[] = {
	"aes", "des", "kasumi", "camellia", "md5", "sha1", "sha256",
	"sha512", "mpmul", "montmul", "montsqr", "crc32c",
	};

	void cpucap_info(struct seq_file *m)
	{
	unsigned long caps = sparc64_elf_hwcap;
	int i, printed = 0;

	seq_puts(m, "cpucaps\t\t: ");
	for (i = 0; i < ARRAY_SIZE(hwcaps); i++) {
	unsigned long bit = 1UL << i;
	if (hwcaps[i] && (caps & bit)) {
	seq_printf(m, "%s%s",
	printed ? "," : "", hwcaps[i]);
	printed++;
	}
	}
	if (caps & HWCAP_SPARC_CRYPTO) {
	unsigned long cfr;

	__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
	for (i = 0; i < ARRAY_SIZE(crypto_hwcaps); i++) {
	unsigned long bit = 1UL << i;
	if (cfr & bit) {
	seq_printf(m, "%s%s",
	printed ? "," : "", crypto_hwcaps[i]);
	printed++;
	}
	}
	}
	seq_putc(m, '\n');
	}

	static void __init report_one_hwcap(int printed, const char name)
	{
	if ((*printed) == 0)
	printk(KERN_INFO "CPU CAPS: [");
	printk(KERN_CONT "%s%s",
	(*printed) ? "," : "", name);
	if (++(*printed) == 8) {
	printk(KERN_CONT "]\n");
	*printed = 0;
	}
	}

	static void __init report_crypto_hwcaps(int *printed)
	{
	unsigned long cfr;
	int i;

	__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));

	for (i = 0; i < ARRAY_SIZE(crypto_hwcaps); i++) {
	unsigned long bit = 1UL << i;
	if (cfr & bit)
	report_one_hwcap(printed, crypto_hwcaps[i]);
	}
	}

	static void __init report_hwcaps(unsigned long caps)
	{
	int i, printed = 0;

	for (i = 0; i < ARRAY_SIZE(hwcaps); i++) {
	unsigned long bit = 1UL << i;
	if (hwcaps[i] && (caps & bit))
	report_one_hwcap(&printed, hwcaps[i]);
	}
	if (caps & HWCAP_SPARC_CRYPTO)
	report_crypto_hwcaps(&printed);
	if (printed != 0)
	printk(KERN_CONT "]\n");
	}

	static unsigned long __init mdesc_cpu_hwcap_list(void)
	{
	struct mdesc_handle *hp;
	unsigned long caps = 0;
	const char *prop;
	int len;
	u64 pn;

	hp = mdesc_grab();
	if (!hp)
	return 0;

	pn = mdesc_node_by_name(hp, MDESC_NODE_NULL, "cpu");
	if (pn == MDESC_NODE_NULL)
	goto out;

	prop = mdesc_get_property(hp, pn, "hwcap-list", &len);
	if (!prop)
	goto out;

	while (len) {
	int i, plen;

	for (i = 0; i < ARRAY_SIZE(hwcaps); i++) {
	unsigned long bit = 1UL << i;

	if (hwcaps[i] && !strcmp(prop, hwcaps[i])) {
	caps \|= bit;
	break;
	}
	}
	for (i = 0; i < ARRAY_SIZE(crypto_hwcaps); i++) {
	if (!strcmp(prop, crypto_hwcaps[i]))
	caps \|= HWCAP_SPARC_CRYPTO;
	}

	plen = strlen(prop) + 1;
	prop += plen;
	len -= plen;
	}

	out:
	mdesc_release(hp);
	return caps;
	}

	/* This yields a mask that user programs can use to figure out what
	* instruction set this cpu supports.
	*/
	static void __init init_sparc64_elf_hwcap(void)
	{
	unsigned long cap = sparc64_elf_hwcap;
	unsigned long mdesc_caps;

	if (tlb_type == cheetah \|\| tlb_type == cheetah_plus)
	cap \|= HWCAP_SPARC_ULTRA3;
	else if (tlb_type == hypervisor) {
	if (sun4v_chip_type == SUN4V_CHIP_NIAGARA1 \|\|
	sun4v_chip_type == SUN4V_CHIP_NIAGARA2 \|\|
	sun4v_chip_type == SUN4V_CHIP_NIAGARA3 \|\|
	sun4v_chip_type == SUN4V_CHIP_NIAGARA4 \|\|
	sun4v_chip_type == SUN4V_CHIP_NIAGARA5 \|\|
	sun4v_chip_type == SUN4V_CHIP_SPARC_M6 \|\|
	sun4v_chip_type == SUN4V_CHIP_SPARC_M7 \|\|
	sun4v_chip_type == SUN4V_CHIP_SPARC_M8 \|\|
	sun4v_chip_type == SUN4V_CHIP_SPARC_SN \|\|
	sun4v_chip_type == SUN4V_CHIP_SPARC64X)
	cap \|= HWCAP_SPARC_BLKINIT;
	if (sun4v_chip_type == SUN4V_CHIP_NIAGARA2 \|\|
	sun4v_chip_type == SUN4V_CHIP_NIAGARA3 \|\|
	sun4v_chip_type == SUN4V_CHIP_NIAGARA4 \|\|
	sun4v_chip_type == SUN4V_CHIP_NIAGARA5 \|\|
	sun4v_chip_type == SUN4V_CHIP_SPARC_M6 \|\|
	sun4v_chip_type == SUN4V_CHIP_SPARC_M7 \|\|
	sun4v_chip_type == SUN4V_CHIP_SPARC_M8 \|\|
	sun4v_chip_type == SUN4V_CHIP_SPARC_SN \|\|
	sun4v_chip_type == SUN4V_CHIP_SPARC64X)
	cap \|= HWCAP_SPARC_N2;
	}

	cap \|= (AV_SPARC_MUL32 \| AV_SPARC_DIV32 \| AV_SPARC_V8PLUS);

	mdesc_caps = mdesc_cpu_hwcap_list();
	if (!mdesc_caps) {
	if (tlb_type == spitfire)
	cap \|= AV_SPARC_VIS;
	if (tlb_type == cheetah \|\| tlb_type == cheetah_plus)
	cap \|= AV_SPARC_VIS \| AV_SPARC_VIS2;
	if (tlb_type == cheetah_plus) {
	unsigned long impl, ver;

	__asm__ __volatile__("rdpr %%ver, %0" : "=r" (ver));
	impl = ((ver >> 32) & 0xffff);
	if (impl == PANTHER_IMPL)
	cap \|= AV_SPARC_POPC;
	}
	if (tlb_type == hypervisor) {
	if (sun4v_chip_type == SUN4V_CHIP_NIAGARA1)
	cap \|= AV_SPARC_ASI_BLK_INIT;
	if (sun4v_chip_type == SUN4V_CHIP_NIAGARA2 \|\|
	sun4v_chip_type == SUN4V_CHIP_NIAGARA3 \|\|
	sun4v_chip_type == SUN4V_CHIP_NIAGARA4 \|\|
	sun4v_chip_type == SUN4V_CHIP_NIAGARA5 \|\|
	sun4v_chip_type == SUN4V_CHIP_SPARC_M6 \|\|
	sun4v_chip_type == SUN4V_CHIP_SPARC_M7 \|\|
	sun4v_chip_type == SUN4V_CHIP_SPARC_M8 \|\|
	sun4v_chip_type == SUN4V_CHIP_SPARC_SN \|\|
	sun4v_chip_type == SUN4V_CHIP_SPARC64X)
	cap \|= (AV_SPARC_VIS \| AV_SPARC_VIS2 \|
	AV_SPARC_ASI_BLK_INIT \|
	AV_SPARC_POPC);
	if (sun4v_chip_type == SUN4V_CHIP_NIAGARA3 \|\|
	sun4v_chip_type == SUN4V_CHIP_NIAGARA4 \|\|
	sun4v_chip_type == SUN4V_CHIP_NIAGARA5 \|\|
	sun4v_chip_type == SUN4V_CHIP_SPARC_M6 \|\|
	sun4v_chip_type == SUN4V_CHIP_SPARC_M7 \|\|
	sun4v_chip_type == SUN4V_CHIP_SPARC_M8 \|\|
	sun4v_chip_type == SUN4V_CHIP_SPARC_SN \|\|
	sun4v_chip_type == SUN4V_CHIP_SPARC64X)
	cap \|= (AV_SPARC_VIS3 \| AV_SPARC_HPC \|
	AV_SPARC_FMAF);
	}
	}
	sparc64_elf_hwcap = cap \| mdesc_caps;

	report_hwcaps(sparc64_elf_hwcap);

	if (sparc64_elf_hwcap & AV_SPARC_POPC)
	popc_patch();
	if (sparc64_elf_hwcap & AV_SPARC_PAUSE)
	pause_patch();
	}

	void __init alloc_irqstack_bootmem(void)
	{
	unsigned int i, node;

	for_each_possible_cpu(i) {
	node = cpu_to_node(i);

	softirq_stack[i] = __alloc_bootmem_node(NODE_DATA(node),
	THREAD_SIZE,
	THREAD_SIZE, 0);
	hardirq_stack[i] = __alloc_bootmem_node(NODE_DATA(node),
	THREAD_SIZE,
	THREAD_SIZE, 0);
	}
	}

	void __init setup_arch(char **cmdline_p)
	{
	/* 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);
	#ifdef CONFIG_EARLYFB
	if (btext_find_display())
	#endif
	register_console(&prom_early_console);

	if (tlb_type == hypervisor)
	printk("ARCH: SUN4V\n");
	else
	printk("ARCH: SUN4U\n");

	#ifdef CONFIG_DUMMY_CONSOLE
	conswitchp = &dummy_con;
	#endif

	idprom_init();

	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;
	rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
	rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);
	#endif

	task_thread_info(&init_task)->kregs = &fake_swapper_regs;

	#ifdef CONFIG_IP_PNP
	if (!ic_set_manually) {
	phandle chosen = prom_finddevice("/chosen");
	u32 cl, sv, gw;

	cl = prom_getintdefault (chosen, "client-ip", 0);
	sv = prom_getintdefault (chosen, "server-ip", 0);
	gw = prom_getintdefault (chosen, "gateway-ip", 0);
	if (cl && sv) {
	ic_myaddr = cl;
	ic_servaddr = sv;
	if (gw)
	ic_gateway = gw;
	#if defined(CONFIG_IP_PNP_BOOTP) \|\| defined(CONFIG_IP_PNP_RARP)
	ic_proto_enabled = 0;
	#endif
	}
	}
	#endif

	/* Get boot processor trap_block[] setup. */
	init_cur_cpu_trap(current_thread_info());

	paging_init();
	init_sparc64_elf_hwcap();
	smp_fill_in_cpu_possible_map();
	/*
	* Once the OF device tree and MDESC have been setup and nr_cpus has
	* been parsed, we know the list of possible cpus. Therefore we can
	* allocate the IRQ stacks.
	*/
	alloc_irqstack_bootmem();
	}

	extern int stop_a_enabled;

	void sun_do_break(void)
	{
	if (!stop_a_enabled)
	return;

	prom_printf("\n");
	flush_user_windows();

	prom_cmdline();
	}
	EXPORT_SYMBOL(sun_do_break);

	int stop_a_enabled = 1;
	EXPORT_SYMBOL(stop_a_enabled);