1 // SPDX-License-Identifier: GPL-2.0-only
3 * Common prep/pmac/chrp boot and setup code.
6 #include <linux/module.h>
7 #include <linux/string.h>
8 #include <linux/sched.h>
9 #include <linux/init.h>
10 #include <linux/kernel.h>
11 #include <linux/reboot.h>
12 #include <linux/delay.h>
13 #include <linux/initrd.h>
14 #include <linux/tty.h>
15 #include <linux/seq_file.h>
16 #include <linux/root_dev.h>
17 #include <linux/cpu.h>
18 #include <linux/console.h>
19 #include <linux/memblock.h>
20 #include <linux/export.h>
21 #include <linux/nvram.h>
25 #include <asm/processor.h>
26 #include <asm/pgtable.h>
27 #include <asm/setup.h>
30 #include <asm/cputable.h>
31 #include <asm/bootx.h>
32 #include <asm/btext.h>
33 #include <asm/machdep.h>
34 #include <linux/uaccess.h>
35 #include <asm/pmac_feature.h>
36 #include <asm/sections.h>
37 #include <asm/nvram.h>
40 #include <asm/serial.h>
42 #include <asm/code-patching.h>
43 #include <asm/cpu_has_feature.h>
44 #include <asm/asm-prototypes.h>
45 #include <asm/kdump.h>
46 #include <asm/feature-fixups.h>
52 extern void bootx_init(unsigned long r4, unsigned long phys);
55 EXPORT_SYMBOL_GPL(boot_cpuid_phys);
57 int smp_hw_index[NR_CPUS];
58 EXPORT_SYMBOL(smp_hw_index);
60 unsigned long ISA_DMA_THRESHOLD;
61 unsigned int DMA_MODE_READ;
62 unsigned int DMA_MODE_WRITE;
64 EXPORT_SYMBOL(DMA_MODE_READ);
65 EXPORT_SYMBOL(DMA_MODE_WRITE);
68 * This is run before start_kernel(), the kernel has been relocated
69 * and we are running with enough of the MMU enabled to have our
70 * proper kernel virtual addresses
72 * We do the initial parsing of the flat device-tree and prepares
73 * for the MMU to be fully initialized.
75 notrace void __init machine_init(u64 dt_ptr)
77 unsigned int *addr = (unsigned int *)patch_site_addr(&patch__memset_nocache);
80 /* Configure static keys first, now that we're relocated. */
83 /* Enable early debugging if any specified (see udbg.h) */
86 patch_instruction_site(&patch__memcpy_nocache, PPC_INST_NOP);
88 insn = create_cond_branch(addr, branch_target(addr), 0x820000);
89 patch_instruction(addr, insn); /* replace b by bne cr0 */
91 /* Do some early initialization based on the flat device tree */
92 early_init_devtree(__va(dt_ptr));
96 setup_kdump_trampoline();
99 /* Checks "l2cr=xxxx" command-line option */
100 static int __init ppc_setup_l2cr(char *str)
102 if (cpu_has_feature(CPU_FTR_L2CR)) {
103 unsigned long val = simple_strtoul(str, NULL, 0);
104 printk(KERN_INFO "l2cr set to %lx\n", val);
105 _set_L2CR(0); /* force invalidate by disable cache */
106 _set_L2CR(val); /* and enable it */
110 __setup("l2cr=", ppc_setup_l2cr);
112 /* Checks "l3cr=xxxx" command-line option */
113 static int __init ppc_setup_l3cr(char *str)
115 if (cpu_has_feature(CPU_FTR_L3CR)) {
116 unsigned long val = simple_strtoul(str, NULL, 0);
117 printk(KERN_INFO "l3cr set to %lx\n", val);
118 _set_L3CR(val); /* and enable it */
122 __setup("l3cr=", ppc_setup_l3cr);
124 static int __init ppc_init(void)
126 /* clear the progress line */
128 ppc_md.progress(" ", 0xffff);
130 /* call platform init */
131 if (ppc_md.init != NULL) {
136 arch_initcall(ppc_init);
138 static void *__init alloc_stack(void)
140 void *ptr = memblock_alloc(THREAD_SIZE, THREAD_SIZE);
143 panic("cannot allocate %d bytes for stack at %pS\n",
144 THREAD_SIZE, (void *)_RET_IP_);
149 void __init irqstack_early_init(void)
153 /* interrupt stacks must be in lowmem, we get that for free on ppc32
154 * as the memblock is limited to lowmem by default */
155 for_each_possible_cpu(i) {
156 softirq_ctx[i] = alloc_stack();
157 hardirq_ctx[i] = alloc_stack();
161 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
162 void __init exc_lvl_early_init(void)
164 unsigned int i, hw_cpu;
166 /* interrupt stacks must be in lowmem, we get that for free on ppc32
167 * as the memblock is limited to lowmem by MEMBLOCK_REAL_LIMIT */
168 for_each_possible_cpu(i) {
170 hw_cpu = get_hard_smp_processor_id(i);
175 critirq_ctx[hw_cpu] = alloc_stack();
177 dbgirq_ctx[hw_cpu] = alloc_stack();
178 mcheckirq_ctx[hw_cpu] = alloc_stack();
184 void __init setup_power_save(void)
186 #ifdef CONFIG_PPC_BOOK3S_32
187 if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
188 cpu_has_feature(CPU_FTR_CAN_NAP))
189 ppc_md.power_save = ppc6xx_idle;
193 if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
194 cpu_has_feature(CPU_FTR_CAN_NAP))
195 ppc_md.power_save = e500_idle;
199 __init void initialize_cache_info(void)
202 * Set cache line size based on type of cpu as a default.
203 * Systems with OF can look in the properties on the cpu node(s)
204 * for a possibly more accurate value.
206 dcache_bsize = cur_cpu_spec->dcache_bsize;
207 icache_bsize = cur_cpu_spec->icache_bsize;
209 if (cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE))
210 ucache_bsize = icache_bsize = dcache_bsize;