diff options
Diffstat (limited to 'arch/powerpc/kernel/prom.c')
| -rw-r--r-- | arch/powerpc/kernel/prom.c | 35 |
1 files changed, 33 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c index 31d5b22c59a2..8a9359ae4718 100644 --- a/arch/powerpc/kernel/prom.c +++ b/arch/powerpc/kernel/prom.c @@ -1043,6 +1043,33 @@ static void __init early_reserve_mem(void) #ifdef CONFIG_PHYP_DUMP /** + * phyp_dump_calculate_reserve_size() - reserve variable boot area 5% or arg + * + * Function to find the largest size we need to reserve + * during early boot process. + * + * It either looks for boot param and returns that OR + * returns larger of 256 or 5% rounded down to multiples of 256MB. + * + */ +static inline unsigned long phyp_dump_calculate_reserve_size(void) +{ + unsigned long tmp; + + if (phyp_dump_info->reserve_bootvar) + return phyp_dump_info->reserve_bootvar; + + /* divide by 20 to get 5% of value */ + tmp = lmb_end_of_DRAM(); + do_div(tmp, 20); + + /* round it down in multiples of 256 */ + tmp = tmp & ~0x0FFFFFFFUL; + + return (tmp > PHYP_DUMP_RMR_END ? tmp : PHYP_DUMP_RMR_END); +} + +/** * phyp_dump_reserve_mem() - reserve all not-yet-dumped mmemory * * This routine may reserve memory regions in the kernel only @@ -1055,6 +1082,8 @@ static void __init early_reserve_mem(void) static void __init phyp_dump_reserve_mem(void) { unsigned long base, size; + unsigned long variable_reserve_size; + if (!phyp_dump_info->phyp_dump_configured) { printk(KERN_ERR "Phyp-dump not supported on this hardware\n"); return; @@ -1065,9 +1094,11 @@ static void __init phyp_dump_reserve_mem(void) return; } + variable_reserve_size = phyp_dump_calculate_reserve_size(); + if (phyp_dump_info->phyp_dump_is_active) { /* Reserve *everything* above RMR.Area freed by userland tools*/ - base = PHYP_DUMP_RMR_END; + base = variable_reserve_size; size = lmb_end_of_DRAM() - base; /* XXX crashed_ram_end is wrong, since it may be beyond @@ -1079,7 +1110,7 @@ static void __init phyp_dump_reserve_mem(void) } else { size = phyp_dump_info->cpu_state_size + phyp_dump_info->hpte_region_size + - PHYP_DUMP_RMR_END; + variable_reserve_size; base = lmb_end_of_DRAM() - size; lmb_reserve(base, size); phyp_dump_info->init_reserve_start = base; |