Loading...
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Common prep/pmac/chrp boot and setup code.
4 */
5
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>
22#include <linux/pgtable.h>
23
24#include <asm/io.h>
25#include <asm/prom.h>
26#include <asm/processor.h>
27#include <asm/setup.h>
28#include <asm/smp.h>
29#include <asm/elf.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>
38#include <asm/xmon.h>
39#include <asm/time.h>
40#include <asm/serial.h>
41#include <asm/udbg.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>
47#include <asm/early_ioremap.h>
48
49#include "setup.h"
50
51#define DBG(fmt...)
52
53extern void bootx_init(unsigned long r4, unsigned long phys);
54
55int boot_cpuid_phys;
56EXPORT_SYMBOL_GPL(boot_cpuid_phys);
57
58int smp_hw_index[NR_CPUS];
59EXPORT_SYMBOL(smp_hw_index);
60
61unsigned int DMA_MODE_READ;
62unsigned int DMA_MODE_WRITE;
63
64EXPORT_SYMBOL(DMA_MODE_READ);
65EXPORT_SYMBOL(DMA_MODE_WRITE);
66
67/*
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
71 *
72 * We do the initial parsing of the flat device-tree and prepares
73 * for the MMU to be fully initialized.
74 */
75notrace void __init machine_init(u64 dt_ptr)
76{
77 struct ppc_inst *addr = (struct ppc_inst *)patch_site_addr(&patch__memset_nocache);
78 struct ppc_inst insn;
79
80 /* Configure static keys first, now that we're relocated. */
81 setup_feature_keys();
82
83 early_ioremap_init();
84
85 /* Enable early debugging if any specified (see udbg.h) */
86 udbg_early_init();
87
88 patch_instruction_site(&patch__memcpy_nocache, ppc_inst(PPC_INST_NOP));
89
90 create_cond_branch(&insn, addr, branch_target(addr), 0x820000);
91 patch_instruction(addr, insn); /* replace b by bne cr0 */
92
93 /* Do some early initialization based on the flat device tree */
94 early_init_devtree(__va(dt_ptr));
95
96 early_init_mmu();
97
98 setup_kdump_trampoline();
99}
100
101/* Checks "l2cr=xxxx" command-line option */
102static int __init ppc_setup_l2cr(char *str)
103{
104 if (cpu_has_feature(CPU_FTR_L2CR)) {
105 unsigned long val = simple_strtoul(str, NULL, 0);
106 printk(KERN_INFO "l2cr set to %lx\n", val);
107 _set_L2CR(0); /* force invalidate by disable cache */
108 _set_L2CR(val); /* and enable it */
109 }
110 return 1;
111}
112__setup("l2cr=", ppc_setup_l2cr);
113
114/* Checks "l3cr=xxxx" command-line option */
115static int __init ppc_setup_l3cr(char *str)
116{
117 if (cpu_has_feature(CPU_FTR_L3CR)) {
118 unsigned long val = simple_strtoul(str, NULL, 0);
119 printk(KERN_INFO "l3cr set to %lx\n", val);
120 _set_L3CR(val); /* and enable it */
121 }
122 return 1;
123}
124__setup("l3cr=", ppc_setup_l3cr);
125
126static int __init ppc_init(void)
127{
128 /* clear the progress line */
129 if (ppc_md.progress)
130 ppc_md.progress(" ", 0xffff);
131
132 /* call platform init */
133 if (ppc_md.init != NULL) {
134 ppc_md.init();
135 }
136 return 0;
137}
138arch_initcall(ppc_init);
139
140static void *__init alloc_stack(void)
141{
142 void *ptr = memblock_alloc(THREAD_SIZE, THREAD_ALIGN);
143
144 if (!ptr)
145 panic("cannot allocate %d bytes for stack at %pS\n",
146 THREAD_SIZE, (void *)_RET_IP_);
147
148 return ptr;
149}
150
151void __init irqstack_early_init(void)
152{
153 unsigned int i;
154
155 if (IS_ENABLED(CONFIG_VMAP_STACK))
156 return;
157
158 /* interrupt stacks must be in lowmem, we get that for free on ppc32
159 * as the memblock is limited to lowmem by default */
160 for_each_possible_cpu(i) {
161 softirq_ctx[i] = alloc_stack();
162 hardirq_ctx[i] = alloc_stack();
163 }
164}
165
166#ifdef CONFIG_VMAP_STACK
167void *emergency_ctx[NR_CPUS] __ro_after_init;
168
169void __init emergency_stack_init(void)
170{
171 unsigned int i;
172
173 for_each_possible_cpu(i)
174 emergency_ctx[i] = alloc_stack();
175}
176#endif
177
178#if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
179void __init exc_lvl_early_init(void)
180{
181 unsigned int i, hw_cpu;
182
183 /* interrupt stacks must be in lowmem, we get that for free on ppc32
184 * as the memblock is limited to lowmem by MEMBLOCK_REAL_LIMIT */
185 for_each_possible_cpu(i) {
186#ifdef CONFIG_SMP
187 hw_cpu = get_hard_smp_processor_id(i);
188#else
189 hw_cpu = 0;
190#endif
191
192 critirq_ctx[hw_cpu] = alloc_stack();
193#ifdef CONFIG_BOOKE
194 dbgirq_ctx[hw_cpu] = alloc_stack();
195 mcheckirq_ctx[hw_cpu] = alloc_stack();
196#endif
197 }
198}
199#endif
200
201void __init setup_power_save(void)
202{
203#ifdef CONFIG_PPC_BOOK3S_32
204 if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
205 cpu_has_feature(CPU_FTR_CAN_NAP))
206 ppc_md.power_save = ppc6xx_idle;
207#endif
208
209#ifdef CONFIG_E500
210 if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
211 cpu_has_feature(CPU_FTR_CAN_NAP))
212 ppc_md.power_save = e500_idle;
213#endif
214}
215
216__init void initialize_cache_info(void)
217{
218 /*
219 * Set cache line size based on type of cpu as a default.
220 * Systems with OF can look in the properties on the cpu node(s)
221 * for a possibly more accurate value.
222 */
223 dcache_bsize = cur_cpu_spec->dcache_bsize;
224 icache_bsize = cur_cpu_spec->icache_bsize;
225 ucache_bsize = 0;
226 if (IS_ENABLED(CONFIG_PPC_BOOK3S_601) || IS_ENABLED(CONFIG_E200))
227 ucache_bsize = icache_bsize = dcache_bsize;
228}
1/*
2 * Common prep/pmac/chrp boot and setup code.
3 */
4
5#include <linux/module.h>
6#include <linux/string.h>
7#include <linux/sched.h>
8#include <linux/init.h>
9#include <linux/kernel.h>
10#include <linux/reboot.h>
11#include <linux/delay.h>
12#include <linux/initrd.h>
13#include <linux/tty.h>
14#include <linux/bootmem.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
21#include <asm/io.h>
22#include <asm/prom.h>
23#include <asm/processor.h>
24#include <asm/pgtable.h>
25#include <asm/setup.h>
26#include <asm/smp.h>
27#include <asm/elf.h>
28#include <asm/cputable.h>
29#include <asm/bootx.h>
30#include <asm/btext.h>
31#include <asm/machdep.h>
32#include <asm/uaccess.h>
33#include <asm/pmac_feature.h>
34#include <asm/sections.h>
35#include <asm/nvram.h>
36#include <asm/xmon.h>
37#include <asm/time.h>
38#include <asm/serial.h>
39#include <asm/udbg.h>
40#include <asm/mmu_context.h>
41#include <asm/epapr_hcalls.h>
42
43#define DBG(fmt...)
44
45extern void bootx_init(unsigned long r4, unsigned long phys);
46
47int boot_cpuid_phys;
48EXPORT_SYMBOL_GPL(boot_cpuid_phys);
49
50int smp_hw_index[NR_CPUS];
51
52unsigned long ISA_DMA_THRESHOLD;
53unsigned int DMA_MODE_READ;
54unsigned int DMA_MODE_WRITE;
55
56#ifdef CONFIG_VGA_CONSOLE
57unsigned long vgacon_remap_base;
58EXPORT_SYMBOL(vgacon_remap_base);
59#endif
60
61/*
62 * These are used in binfmt_elf.c to put aux entries on the stack
63 * for each elf executable being started.
64 */
65int dcache_bsize;
66int icache_bsize;
67int ucache_bsize;
68
69/*
70 * We're called here very early in the boot. We determine the machine
71 * type and call the appropriate low-level setup functions.
72 * -- Cort <cort@fsmlabs.com>
73 *
74 * Note that the kernel may be running at an address which is different
75 * from the address that it was linked at, so we must use RELOC/PTRRELOC
76 * to access static data (including strings). -- paulus
77 */
78notrace unsigned long __init early_init(unsigned long dt_ptr)
79{
80 unsigned long offset = reloc_offset();
81 struct cpu_spec *spec;
82
83 /* First zero the BSS -- use memset_io, some platforms don't have
84 * caches on yet */
85 memset_io((void __iomem *)PTRRELOC(&__bss_start), 0,
86 __bss_stop - __bss_start);
87
88 /*
89 * Identify the CPU type and fix up code sections
90 * that depend on which cpu we have.
91 */
92 spec = identify_cpu(offset, mfspr(SPRN_PVR));
93
94 do_feature_fixups(spec->cpu_features,
95 PTRRELOC(&__start___ftr_fixup),
96 PTRRELOC(&__stop___ftr_fixup));
97
98 do_feature_fixups(spec->mmu_features,
99 PTRRELOC(&__start___mmu_ftr_fixup),
100 PTRRELOC(&__stop___mmu_ftr_fixup));
101
102 do_lwsync_fixups(spec->cpu_features,
103 PTRRELOC(&__start___lwsync_fixup),
104 PTRRELOC(&__stop___lwsync_fixup));
105
106 do_final_fixups();
107
108 return KERNELBASE + offset;
109}
110
111
112/*
113 * Find out what kind of machine we're on and save any data we need
114 * from the early boot process (devtree is copied on pmac by prom_init()).
115 * This is called very early on the boot process, after a minimal
116 * MMU environment has been set up but before MMU_init is called.
117 */
118notrace void __init machine_init(u64 dt_ptr)
119{
120 lockdep_init();
121
122 /* Enable early debugging if any specified (see udbg.h) */
123 udbg_early_init();
124
125 /* Do some early initialization based on the flat device tree */
126 early_init_devtree(__va(dt_ptr));
127
128 epapr_paravirt_early_init();
129
130 early_init_mmu();
131
132 probe_machine();
133
134 setup_kdump_trampoline();
135
136#ifdef CONFIG_6xx
137 if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
138 cpu_has_feature(CPU_FTR_CAN_NAP))
139 ppc_md.power_save = ppc6xx_idle;
140#endif
141
142#ifdef CONFIG_E500
143 if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
144 cpu_has_feature(CPU_FTR_CAN_NAP))
145 ppc_md.power_save = e500_idle;
146#endif
147 if (ppc_md.progress)
148 ppc_md.progress("id mach(): done", 0x200);
149}
150
151/* Checks "l2cr=xxxx" command-line option */
152int __init ppc_setup_l2cr(char *str)
153{
154 if (cpu_has_feature(CPU_FTR_L2CR)) {
155 unsigned long val = simple_strtoul(str, NULL, 0);
156 printk(KERN_INFO "l2cr set to %lx\n", val);
157 _set_L2CR(0); /* force invalidate by disable cache */
158 _set_L2CR(val); /* and enable it */
159 }
160 return 1;
161}
162__setup("l2cr=", ppc_setup_l2cr);
163
164/* Checks "l3cr=xxxx" command-line option */
165int __init ppc_setup_l3cr(char *str)
166{
167 if (cpu_has_feature(CPU_FTR_L3CR)) {
168 unsigned long val = simple_strtoul(str, NULL, 0);
169 printk(KERN_INFO "l3cr set to %lx\n", val);
170 _set_L3CR(val); /* and enable it */
171 }
172 return 1;
173}
174__setup("l3cr=", ppc_setup_l3cr);
175
176#ifdef CONFIG_GENERIC_NVRAM
177
178/* Generic nvram hooks used by drivers/char/gen_nvram.c */
179unsigned char nvram_read_byte(int addr)
180{
181 if (ppc_md.nvram_read_val)
182 return ppc_md.nvram_read_val(addr);
183 return 0xff;
184}
185EXPORT_SYMBOL(nvram_read_byte);
186
187void nvram_write_byte(unsigned char val, int addr)
188{
189 if (ppc_md.nvram_write_val)
190 ppc_md.nvram_write_val(addr, val);
191}
192EXPORT_SYMBOL(nvram_write_byte);
193
194ssize_t nvram_get_size(void)
195{
196 if (ppc_md.nvram_size)
197 return ppc_md.nvram_size();
198 return -1;
199}
200EXPORT_SYMBOL(nvram_get_size);
201
202void nvram_sync(void)
203{
204 if (ppc_md.nvram_sync)
205 ppc_md.nvram_sync();
206}
207EXPORT_SYMBOL(nvram_sync);
208
209#endif /* CONFIG_NVRAM */
210
211int __init ppc_init(void)
212{
213 /* clear the progress line */
214 if (ppc_md.progress)
215 ppc_md.progress(" ", 0xffff);
216
217 /* call platform init */
218 if (ppc_md.init != NULL) {
219 ppc_md.init();
220 }
221 return 0;
222}
223
224arch_initcall(ppc_init);
225
226static void __init irqstack_early_init(void)
227{
228 unsigned int i;
229
230 /* interrupt stacks must be in lowmem, we get that for free on ppc32
231 * as the memblock is limited to lowmem by default */
232 for_each_possible_cpu(i) {
233 softirq_ctx[i] = (struct thread_info *)
234 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
235 hardirq_ctx[i] = (struct thread_info *)
236 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
237 }
238}
239
240#if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
241static void __init exc_lvl_early_init(void)
242{
243 unsigned int i, hw_cpu;
244
245 /* interrupt stacks must be in lowmem, we get that for free on ppc32
246 * as the memblock is limited to lowmem by MEMBLOCK_REAL_LIMIT */
247 for_each_possible_cpu(i) {
248#ifdef CONFIG_SMP
249 hw_cpu = get_hard_smp_processor_id(i);
250#else
251 hw_cpu = 0;
252#endif
253
254 critirq_ctx[hw_cpu] = (struct thread_info *)
255 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
256#ifdef CONFIG_BOOKE
257 dbgirq_ctx[hw_cpu] = (struct thread_info *)
258 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
259 mcheckirq_ctx[hw_cpu] = (struct thread_info *)
260 __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
261#endif
262 }
263}
264#else
265#define exc_lvl_early_init()
266#endif
267
268/* Warning, IO base is not yet inited */
269void __init setup_arch(char **cmdline_p)
270{
271 *cmdline_p = cmd_line;
272
273 /* so udelay does something sensible, assume <= 1000 bogomips */
274 loops_per_jiffy = 500000000 / HZ;
275
276 unflatten_device_tree();
277 check_for_initrd();
278
279 if (ppc_md.init_early)
280 ppc_md.init_early();
281
282 find_legacy_serial_ports();
283
284 smp_setup_cpu_maps();
285
286 /* Register early console */
287 register_early_udbg_console();
288
289 xmon_setup();
290
291 /*
292 * Set cache line size based on type of cpu as a default.
293 * Systems with OF can look in the properties on the cpu node(s)
294 * for a possibly more accurate value.
295 */
296 dcache_bsize = cur_cpu_spec->dcache_bsize;
297 icache_bsize = cur_cpu_spec->icache_bsize;
298 ucache_bsize = 0;
299 if (cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE))
300 ucache_bsize = icache_bsize = dcache_bsize;
301
302 if (ppc_md.panic)
303 setup_panic();
304
305 init_mm.start_code = (unsigned long)_stext;
306 init_mm.end_code = (unsigned long) _etext;
307 init_mm.end_data = (unsigned long) _edata;
308 init_mm.brk = klimit;
309
310 exc_lvl_early_init();
311
312 irqstack_early_init();
313
314 /* set up the bootmem stuff with available memory */
315 do_init_bootmem();
316 if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
317
318#ifdef CONFIG_DUMMY_CONSOLE
319 conswitchp = &dummy_con;
320#endif
321
322 if (ppc_md.setup_arch)
323 ppc_md.setup_arch();
324 if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
325
326 paging_init();
327
328 /* Initialize the MMU context management stuff */
329 mmu_context_init();
330}