// 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/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" /* 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[0])); prom_printf("PROM SYNC COMMAND...\n"); show_mem(); 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[0]; /* 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