2 * Common prep/pmac/chrp boot and setup code.
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/lmb.h>
23 #include <asm/processor.h>
24 #include <asm/pgtable.h>
25 #include <asm/setup.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/system.h>
34 #include <asm/pmac_feature.h>
35 #include <asm/sections.h>
36 #include <asm/nvram.h>
39 #include <asm/serial.h>
41 #include <asm/mmu_context.h>
42 #include <asm/swiotlb.h>
48 extern void bootx_init(unsigned long r4, unsigned long phys);
51 EXPORT_SYMBOL_GPL(boot_cpuid);
54 int smp_hw_index[NR_CPUS];
56 unsigned long ISA_DMA_THRESHOLD;
57 unsigned int DMA_MODE_READ;
58 unsigned int DMA_MODE_WRITE;
60 #ifdef CONFIG_VGA_CONSOLE
61 unsigned long vgacon_remap_base;
62 EXPORT_SYMBOL(vgacon_remap_base);
66 * These are used in binfmt_elf.c to put aux entries on the stack
67 * for each elf executable being started.
74 * We're called here very early in the boot. We determine the machine
75 * type and call the appropriate low-level setup functions.
76 * -- Cort <cort@fsmlabs.com>
78 * Note that the kernel may be running at an address which is different
79 * from the address that it was linked at, so we must use RELOC/PTRRELOC
80 * to access static data (including strings). -- paulus
82 notrace unsigned long __init early_init(unsigned long dt_ptr)
84 unsigned long offset = reloc_offset();
85 struct cpu_spec *spec;
87 /* First zero the BSS -- use memset_io, some platforms don't have
89 memset_io((void __iomem *)PTRRELOC(&__bss_start), 0,
90 __bss_stop - __bss_start);
93 * Identify the CPU type and fix up code sections
94 * that depend on which cpu we have.
96 spec = identify_cpu(offset, mfspr(SPRN_PVR));
98 do_feature_fixups(spec->cpu_features,
99 PTRRELOC(&__start___ftr_fixup),
100 PTRRELOC(&__stop___ftr_fixup));
102 do_feature_fixups(spec->mmu_features,
103 PTRRELOC(&__start___mmu_ftr_fixup),
104 PTRRELOC(&__stop___mmu_ftr_fixup));
106 do_lwsync_fixups(spec->cpu_features,
107 PTRRELOC(&__start___lwsync_fixup),
108 PTRRELOC(&__stop___lwsync_fixup));
110 return KERNELBASE + offset;
115 * Find out what kind of machine we're on and save any data we need
116 * from the early boot process (devtree is copied on pmac by prom_init()).
117 * This is called very early on the boot process, after a minimal
118 * MMU environment has been set up but before MMU_init is called.
120 notrace void __init machine_init(unsigned long dt_ptr)
124 /* Enable early debugging if any specified (see udbg.h) */
127 /* Do some early initialization based on the flat device tree */
128 early_init_devtree(__va(dt_ptr));
132 setup_kdump_trampoline();
135 if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
136 cpu_has_feature(CPU_FTR_CAN_NAP))
137 ppc_md.power_save = ppc6xx_idle;
141 if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
142 cpu_has_feature(CPU_FTR_CAN_NAP))
143 ppc_md.power_save = e500_idle;
146 ppc_md.progress("id mach(): done", 0x200);
149 #ifdef CONFIG_BOOKE_WDT
150 /* Checks wdt=x and wdt_period=xx command-line option */
151 notrace int __init early_parse_wdt(char *p)
153 if (p && strncmp(p, "0", 1) != 0)
154 booke_wdt_enabled = 1;
158 early_param("wdt", early_parse_wdt);
160 int __init early_parse_wdt_period (char *p)
163 booke_wdt_period = simple_strtoul(p, NULL, 0);
167 early_param("wdt_period", early_parse_wdt_period);
168 #endif /* CONFIG_BOOKE_WDT */
170 /* Checks "l2cr=xxxx" command-line option */
171 int __init ppc_setup_l2cr(char *str)
173 if (cpu_has_feature(CPU_FTR_L2CR)) {
174 unsigned long val = simple_strtoul(str, NULL, 0);
175 printk(KERN_INFO "l2cr set to %lx\n", val);
176 _set_L2CR(0); /* force invalidate by disable cache */
177 _set_L2CR(val); /* and enable it */
181 __setup("l2cr=", ppc_setup_l2cr);
183 /* Checks "l3cr=xxxx" command-line option */
184 int __init ppc_setup_l3cr(char *str)
186 if (cpu_has_feature(CPU_FTR_L3CR)) {
187 unsigned long val = simple_strtoul(str, NULL, 0);
188 printk(KERN_INFO "l3cr set to %lx\n", val);
189 _set_L3CR(val); /* and enable it */
193 __setup("l3cr=", ppc_setup_l3cr);
195 #ifdef CONFIG_GENERIC_NVRAM
197 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
198 unsigned char nvram_read_byte(int addr)
200 if (ppc_md.nvram_read_val)
201 return ppc_md.nvram_read_val(addr);
204 EXPORT_SYMBOL(nvram_read_byte);
206 void nvram_write_byte(unsigned char val, int addr)
208 if (ppc_md.nvram_write_val)
209 ppc_md.nvram_write_val(addr, val);
211 EXPORT_SYMBOL(nvram_write_byte);
213 void nvram_sync(void)
215 if (ppc_md.nvram_sync)
218 EXPORT_SYMBOL(nvram_sync);
220 #endif /* CONFIG_NVRAM */
222 int __init ppc_init(void)
224 /* clear the progress line */
226 ppc_md.progress(" ", 0xffff);
228 /* call platform init */
229 if (ppc_md.init != NULL) {
235 arch_initcall(ppc_init);
237 #ifdef CONFIG_IRQSTACKS
238 static void __init irqstack_early_init(void)
242 /* interrupt stacks must be in lowmem, we get that for free on ppc32
243 * as the lmb is limited to lowmem by LMB_REAL_LIMIT */
244 for_each_possible_cpu(i) {
245 softirq_ctx[i] = (struct thread_info *)
246 __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE));
247 hardirq_ctx[i] = (struct thread_info *)
248 __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE));
252 #define irqstack_early_init()
255 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
256 static void __init exc_lvl_early_init(void)
260 /* interrupt stacks must be in lowmem, we get that for free on ppc32
261 * as the lmb is limited to lowmem by LMB_REAL_LIMIT */
262 for_each_possible_cpu(i) {
263 critirq_ctx[i] = (struct thread_info *)
264 __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE));
266 dbgirq_ctx[i] = (struct thread_info *)
267 __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE));
268 mcheckirq_ctx[i] = (struct thread_info *)
269 __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE));
274 #define exc_lvl_early_init()
277 /* Warning, IO base is not yet inited */
278 void __init setup_arch(char **cmdline_p)
280 *cmdline_p = cmd_line;
282 /* so udelay does something sensible, assume <= 1000 bogomips */
283 loops_per_jiffy = 500000000 / HZ;
285 unflatten_device_tree();
288 if (ppc_md.init_early)
291 find_legacy_serial_ports();
293 smp_setup_cpu_maps();
295 /* Register early console */
296 register_early_udbg_console();
301 * Set cache line size based on type of cpu as a default.
302 * Systems with OF can look in the properties on the cpu node(s)
303 * for a possibly more accurate value.
305 dcache_bsize = cur_cpu_spec->dcache_bsize;
306 icache_bsize = cur_cpu_spec->icache_bsize;
308 if (cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE))
309 ucache_bsize = icache_bsize = dcache_bsize;
311 /* reboot on panic */
317 init_mm.start_code = (unsigned long)_stext;
318 init_mm.end_code = (unsigned long) _etext;
319 init_mm.end_data = (unsigned long) _edata;
320 init_mm.brk = klimit;
322 exc_lvl_early_init();
324 irqstack_early_init();
326 /* set up the bootmem stuff with available memory */
328 if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
330 #ifdef CONFIG_DUMMY_CONSOLE
331 conswitchp = &dummy_con;
334 if (ppc_md.setup_arch)
336 if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
338 #ifdef CONFIG_SWIOTLB
339 if (ppc_swiotlb_enable)
345 /* Initialize the MMU context management stuff */