diff options
Diffstat (limited to 'arch/powerpc/kernel/prom.c')
| -rw-r--r-- | arch/powerpc/kernel/prom.c | 100 |
1 files changed, 57 insertions, 43 deletions
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c index 9a07f97f0712..969f4abcc0be 100644 --- a/arch/powerpc/kernel/prom.c +++ b/arch/powerpc/kernel/prom.c @@ -50,6 +50,7 @@ #include <asm/machdep.h> #include <asm/pSeries_reconfig.h> #include <asm/pci-bridge.h> +#include <asm/kexec.h> #ifdef DEBUG #define DBG(fmt...) printk(KERN_ERR fmt) @@ -836,6 +837,42 @@ static unsigned long __init unflatten_dt_node(unsigned long mem, return mem; } +static int __init early_parse_mem(char *p) +{ + if (!p) + return 1; + + memory_limit = PAGE_ALIGN(memparse(p, &p)); + DBG("memory limit = 0x%lx\n", memory_limit); + + return 0; +} +early_param("mem", early_parse_mem); + +/* + * The device tree may be allocated below our memory limit, or inside the + * crash kernel region for kdump. If so, move it out now. + */ +static void move_device_tree(void) +{ + unsigned long start, size; + void *p; + + DBG("-> move_device_tree\n"); + + start = __pa(initial_boot_params); + size = initial_boot_params->totalsize; + + if ((memory_limit && (start + size) > memory_limit) || + overlaps_crashkernel(start, size)) { + p = __va(lmb_alloc_base(size, PAGE_SIZE, lmb.rmo_size)); + memcpy(p, initial_boot_params, size); + initial_boot_params = (struct boot_param_header *)p; + DBG("Moved device tree to 0x%p\n", p); + } + + DBG("<- move_device_tree\n"); +} /** * unflattens the device-tree passed by the firmware, creating the @@ -1070,6 +1107,7 @@ static int __init early_init_dt_scan_chosen(unsigned long node, iommu_force_on = 1; #endif + /* mem=x on the command line is the preferred mechanism */ lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL); if (lprop) memory_limit = *lprop; @@ -1123,17 +1161,6 @@ static int __init early_init_dt_scan_chosen(unsigned long node, DBG("Command line is: %s\n", cmd_line); - if (strstr(cmd_line, "mem=")) { - char *p, *q; - - for (q = cmd_line; (p = strstr(q, "mem=")) != 0; ) { - q = p + 4; - if (p > cmd_line && p[-1] != ' ') - continue; - memory_limit = memparse(q, &q); - } - } - /* break now */ return 1; } @@ -1240,6 +1267,11 @@ static void __init early_reserve_mem(void) reserve_map = (u64 *)(((unsigned long)initial_boot_params) + initial_boot_params->off_mem_rsvmap); + + /* before we do anything, lets reserve the dt blob */ + lmb_reserve(__pa((unsigned long)initial_boot_params), + initial_boot_params->totalsize); + #ifdef CONFIG_PPC32 /* * Handle the case where we might be booting from an old kexec @@ -1292,18 +1324,26 @@ void __init early_init_devtree(void *params) lmb_init(); of_scan_flat_dt(early_init_dt_scan_root, NULL); of_scan_flat_dt(early_init_dt_scan_memory, NULL); - lmb_enforce_memory_limit(memory_limit); - lmb_analyze(); - DBG("Phys. mem: %lx\n", lmb_phys_mem_size()); + /* Save command line for /proc/cmdline and then parse parameters */ + strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE); + parse_early_param(); /* Reserve LMB regions used by kernel, initrd, dt, etc... */ lmb_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START); -#ifdef CONFIG_CRASH_DUMP - lmb_reserve(0, KDUMP_RESERVE_LIMIT); -#endif + reserve_kdump_trampoline(); + reserve_crashkernel(); early_reserve_mem(); + lmb_enforce_memory_limit(memory_limit); + lmb_analyze(); + + DBG("Phys. mem: %lx\n", lmb_phys_mem_size()); + + /* We may need to relocate the flat tree, do it now. + * FIXME .. and the initrd too? */ + move_device_tree(); + DBG("Scanning CPUs ...\n"); /* Retreive CPU related informations from the flat tree @@ -2053,29 +2093,3 @@ int prom_update_property(struct device_node *np, return 0; } -#ifdef CONFIG_KEXEC -/* We may have allocated the flat device tree inside the crash kernel region - * in prom_init. If so we need to move it out into regular memory. */ -void kdump_move_device_tree(void) -{ - unsigned long start, end; - struct boot_param_header *new; - - start = __pa((unsigned long)initial_boot_params); - end = start + initial_boot_params->totalsize; - - if (end < crashk_res.start || start > crashk_res.end) - return; - - new = (struct boot_param_header*) - __va(lmb_alloc(initial_boot_params->totalsize, PAGE_SIZE)); - - memcpy(new, initial_boot_params, initial_boot_params->totalsize); - - initial_boot_params = new; - - DBG("Flat device tree blob moved to %p\n", initial_boot_params); - - /* XXX should we unreserve the old DT? */ -} -#endif /* CONFIG_KEXEC */ |
