diff options
Diffstat (limited to 'arch/powerpc/kernel/setup_32.c')
| -rw-r--r-- | arch/powerpc/kernel/setup_32.c | 274 |
1 files changed, 82 insertions, 192 deletions
diff --git a/arch/powerpc/kernel/setup_32.c b/arch/powerpc/kernel/setup_32.c index a8f54ecb091f..5a1bf501fbe1 100644 --- a/arch/powerpc/kernel/setup_32.c +++ b/arch/powerpc/kernel/setup_32.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * Common prep/pmac/chrp boot and setup code. */ @@ -11,17 +12,19 @@ #include <linux/delay.h> #include <linux/initrd.h> #include <linux/tty.h> -#include <linux/bootmem.h> #include <linux/seq_file.h> #include <linux/root_dev.h> #include <linux/cpu.h> #include <linux/console.h> #include <linux/memblock.h> +#include <linux/export.h> +#include <linux/nvram.h> +#include <linux/pgtable.h> +#include <linux/of_fdt.h> +#include <linux/irq.h> #include <asm/io.h> -#include <asm/prom.h> #include <asm/processor.h> -#include <asm/pgtable.h> #include <asm/setup.h> #include <asm/smp.h> #include <asm/elf.h> @@ -29,7 +32,7 @@ #include <asm/bootx.h> #include <asm/btext.h> #include <asm/machdep.h> -#include <asm/uaccess.h> +#include <linux/uaccess.h> #include <asm/pmac_feature.h> #include <asm/sections.h> #include <asm/nvram.h> @@ -37,7 +40,12 @@ #include <asm/time.h> #include <asm/serial.h> #include <asm/udbg.h> -#include <asm/mmu_context.h> +#include <asm/text-patching.h> +#include <asm/cpu_has_feature.h> +#include <asm/asm-prototypes.h> +#include <asm/kdump.h> +#include <asm/feature-fixups.h> +#include <asm/early_ioremap.h> #include "setup.h" @@ -45,112 +53,54 @@ extern void bootx_init(unsigned long r4, unsigned long phys); -int boot_cpuid = -1; -EXPORT_SYMBOL_GPL(boot_cpuid); int boot_cpuid_phys; EXPORT_SYMBOL_GPL(boot_cpuid_phys); int smp_hw_index[NR_CPUS]; +EXPORT_SYMBOL(smp_hw_index); -unsigned long ISA_DMA_THRESHOLD; unsigned int DMA_MODE_READ; unsigned int DMA_MODE_WRITE; -#ifdef CONFIG_VGA_CONSOLE -unsigned long vgacon_remap_base; -EXPORT_SYMBOL(vgacon_remap_base); -#endif - -/* - * These are used in binfmt_elf.c to put aux entries on the stack - * for each elf executable being started. - */ -int dcache_bsize; -int icache_bsize; -int ucache_bsize; +EXPORT_SYMBOL(DMA_MODE_READ); +EXPORT_SYMBOL(DMA_MODE_WRITE); /* - * We're called here very early in the boot. We determine the machine - * type and call the appropriate low-level setup functions. - * -- Cort <cort@fsmlabs.com> + * This is run before start_kernel(), the kernel has been relocated + * and we are running with enough of the MMU enabled to have our + * proper kernel virtual addresses * - * Note that the kernel may be running at an address which is different - * from the address that it was linked at, so we must use RELOC/PTRRELOC - * to access static data (including strings). -- paulus + * We do the initial parsing of the flat device-tree and prepares + * for the MMU to be fully initialized. */ -notrace unsigned long __init early_init(unsigned long dt_ptr) +notrace void __init machine_init(u64 dt_ptr) { - unsigned long offset = reloc_offset(); - struct cpu_spec *spec; - - /* First zero the BSS -- use memset_io, some platforms don't have - * caches on yet */ - memset_io((void __iomem *)PTRRELOC(&__bss_start), 0, - __bss_stop - __bss_start); + u32 *addr = (u32 *)patch_site_addr(&patch__memset_nocache); + ppc_inst_t insn; - /* - * Identify the CPU type and fix up code sections - * that depend on which cpu we have. - */ - spec = identify_cpu(offset, mfspr(SPRN_PVR)); - - do_feature_fixups(spec->cpu_features, - PTRRELOC(&__start___ftr_fixup), - PTRRELOC(&__stop___ftr_fixup)); + /* Configure static keys first, now that we're relocated. */ + setup_feature_keys(); - do_feature_fixups(spec->mmu_features, - PTRRELOC(&__start___mmu_ftr_fixup), - PTRRELOC(&__stop___mmu_ftr_fixup)); - - do_lwsync_fixups(spec->cpu_features, - PTRRELOC(&__start___lwsync_fixup), - PTRRELOC(&__stop___lwsync_fixup)); - - do_final_fixups(); - - return KERNELBASE + offset; -} - - -/* - * Find out what kind of machine we're on and save any data we need - * from the early boot process (devtree is copied on pmac by prom_init()). - * This is called very early on the boot process, after a minimal - * MMU environment has been set up but before MMU_init is called. - */ -notrace void __init machine_init(u64 dt_ptr) -{ - lockdep_init(); + early_ioremap_init(); /* Enable early debugging if any specified (see udbg.h) */ udbg_early_init(); + patch_instruction_site(&patch__memcpy_nocache, ppc_inst(PPC_RAW_NOP())); + + create_cond_branch(&insn, addr, branch_target(addr), 0x820000); + patch_instruction(addr, insn); /* replace b by bne cr0 */ + /* Do some early initialization based on the flat device tree */ early_init_devtree(__va(dt_ptr)); early_init_mmu(); - probe_machine(); - setup_kdump_trampoline(); - -#ifdef CONFIG_6xx - if (cpu_has_feature(CPU_FTR_CAN_DOZE) || - cpu_has_feature(CPU_FTR_CAN_NAP)) - ppc_md.power_save = ppc6xx_idle; -#endif - -#ifdef CONFIG_E500 - if (cpu_has_feature(CPU_FTR_CAN_DOZE) || - cpu_has_feature(CPU_FTR_CAN_NAP)) - ppc_md.power_save = e500_idle; -#endif - if (ppc_md.progress) - ppc_md.progress("id mach(): done", 0x200); } /* Checks "l2cr=xxxx" command-line option */ -int __init ppc_setup_l2cr(char *str) +static int __init ppc_setup_l2cr(char *str) { if (cpu_has_feature(CPU_FTR_L2CR)) { unsigned long val = simple_strtoul(str, NULL, 0); @@ -163,7 +113,7 @@ int __init ppc_setup_l2cr(char *str) __setup("l2cr=", ppc_setup_l2cr); /* Checks "l3cr=xxxx" command-line option */ -int __init ppc_setup_l3cr(char *str) +static int __init ppc_setup_l3cr(char *str) { if (cpu_has_feature(CPU_FTR_L3CR)) { unsigned long val = simple_strtoul(str, NULL, 0); @@ -174,42 +124,7 @@ int __init ppc_setup_l3cr(char *str) } __setup("l3cr=", ppc_setup_l3cr); -#ifdef CONFIG_GENERIC_NVRAM - -/* Generic nvram hooks used by drivers/char/gen_nvram.c */ -unsigned char nvram_read_byte(int addr) -{ - if (ppc_md.nvram_read_val) - return ppc_md.nvram_read_val(addr); - return 0xff; -} -EXPORT_SYMBOL(nvram_read_byte); - -void nvram_write_byte(unsigned char val, int addr) -{ - if (ppc_md.nvram_write_val) - ppc_md.nvram_write_val(addr, val); -} -EXPORT_SYMBOL(nvram_write_byte); - -ssize_t nvram_get_size(void) -{ - if (ppc_md.nvram_size) - return ppc_md.nvram_size(); - return -1; -} -EXPORT_SYMBOL(nvram_get_size); - -void nvram_sync(void) -{ - if (ppc_md.nvram_sync) - ppc_md.nvram_sync(); -} -EXPORT_SYMBOL(nvram_sync); - -#endif /* CONFIG_NVRAM */ - -int __init ppc_init(void) +static int __init ppc_init(void) { /* clear the progress line */ if (ppc_md.progress) @@ -221,69 +136,80 @@ int __init ppc_init(void) } return 0; } - arch_initcall(ppc_init); -static void __init irqstack_early_init(void) +static void *__init alloc_stack(void) +{ + return memblock_alloc_or_panic(THREAD_SIZE, THREAD_ALIGN); +} + +void __init irqstack_early_init(void) { unsigned int i; + if (IS_ENABLED(CONFIG_VMAP_STACK)) + return; + /* interrupt stacks must be in lowmem, we get that for free on ppc32 * as the memblock is limited to lowmem by default */ for_each_possible_cpu(i) { - softirq_ctx[i] = (struct thread_info *) - __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE)); - hardirq_ctx[i] = (struct thread_info *) - __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE)); + softirq_ctx[i] = alloc_stack(); + hardirq_ctx[i] = alloc_stack(); } } -#if defined(CONFIG_BOOKE) || defined(CONFIG_40x) -static void __init exc_lvl_early_init(void) +#ifdef CONFIG_VMAP_STACK +void *emergency_ctx[NR_CPUS] __ro_after_init = {[0] = &init_stack}; + +void __init emergency_stack_init(void) +{ + unsigned int i; + + for_each_possible_cpu(i) + emergency_ctx[i] = alloc_stack(); +} +#endif + +#ifdef CONFIG_BOOKE +void __init exc_lvl_early_init(void) { unsigned int i, hw_cpu; /* interrupt stacks must be in lowmem, we get that for free on ppc32 * as the memblock is limited to lowmem by MEMBLOCK_REAL_LIMIT */ for_each_possible_cpu(i) { +#ifdef CONFIG_SMP hw_cpu = get_hard_smp_processor_id(i); - critirq_ctx[hw_cpu] = (struct thread_info *) - __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE)); +#else + hw_cpu = 0; +#endif + + critirq_ctx[hw_cpu] = alloc_stack(); #ifdef CONFIG_BOOKE - dbgirq_ctx[hw_cpu] = (struct thread_info *) - __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE)); - mcheckirq_ctx[hw_cpu] = (struct thread_info *) - __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE)); + dbgirq_ctx[hw_cpu] = alloc_stack(); + mcheckirq_ctx[hw_cpu] = alloc_stack(); #endif } } -#else -#define exc_lvl_early_init() #endif -/* Warning, IO base is not yet inited */ -void __init setup_arch(char **cmdline_p) +void __init setup_power_save(void) { - *cmdline_p = cmd_line; - - /* so udelay does something sensible, assume <= 1000 bogomips */ - loops_per_jiffy = 500000000 / HZ; - - unflatten_device_tree(); - check_for_initrd(); - - if (ppc_md.init_early) - ppc_md.init_early(); - - find_legacy_serial_ports(); - - smp_setup_cpu_maps(); - - /* Register early console */ - register_early_udbg_console(); +#ifdef CONFIG_PPC_BOOK3S_32 + if (cpu_has_feature(CPU_FTR_CAN_DOZE) || + cpu_has_feature(CPU_FTR_CAN_NAP)) + ppc_md.power_save = ppc6xx_idle; +#endif - xmon_setup(); +#ifdef CONFIG_PPC_E500 + if (cpu_has_feature(CPU_FTR_CAN_DOZE) || + cpu_has_feature(CPU_FTR_CAN_NAP)) + ppc_md.power_save = e500_idle; +#endif +} +__init void initialize_cache_info(void) +{ /* * Set cache line size based on type of cpu as a default. * Systems with OF can look in the properties on the cpu node(s) @@ -291,40 +217,4 @@ void __init setup_arch(char **cmdline_p) */ dcache_bsize = cur_cpu_spec->dcache_bsize; icache_bsize = cur_cpu_spec->icache_bsize; - ucache_bsize = 0; - if (cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE)) - ucache_bsize = icache_bsize = dcache_bsize; - - /* reboot on panic */ - panic_timeout = 180; - - if (ppc_md.panic) - setup_panic(); - - init_mm.start_code = (unsigned long)_stext; - init_mm.end_code = (unsigned long) _etext; - init_mm.end_data = (unsigned long) _edata; - init_mm.brk = klimit; - - exc_lvl_early_init(); - - irqstack_early_init(); - - /* set up the bootmem stuff with available memory */ - do_init_bootmem(); - if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab); - -#ifdef CONFIG_DUMMY_CONSOLE - conswitchp = &dummy_con; -#endif - - if (ppc_md.setup_arch) - ppc_md.setup_arch(); - if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab); - - paging_init(); - - /* Initialize the MMU context management stuff */ - mmu_context_init(); - } |