From 37dd2badcfcec35f5e21a0926968d77a404f03c3 Mon Sep 17 00:00:00 2001 From: Kumar Gala Date: Tue, 22 Apr 2008 04:22:34 +1000 Subject: [POWERPC] 85xx: Add support for relocatable kernel (and booting at non-zero) Added support to allow an 85xx kernel to be run from a non-zero physical address (useful for cooperative asymmetric multiprocessing situations and kdump). The support can be configured at compile time by setting CONFIG_PAGE_OFFSET, CONFIG_KERNEL_START, and CONFIG_PHYSICAL_START as desired. Alternatively, the kernel build can set CONFIG_RELOCATABLE. Setting this config option causes the kernel to determine at runtime the physical addresses of CONFIG_PAGE_OFFSET and CONFIG_KERNEL_START. If CONFIG_RELOCATABLE is set, then CONFIG_PHYSICAL_START has no meaning. However, CONFIG_PHYSICAL_START will always be used to set the LOAD program header physical address field in the resulting ELF image. Currently we are limited to running at a physical address that is a multiple of 256M. This is due to how we map TLBs to cover lowmem. This should be fixed to allow 64M or maybe even 16M alignment in the future. It is considered an error to try and run a kernel at a non-aligned physical address. All the magic for this support is accomplished by proper initialization of the kernel memory subsystem and use of ARCH_PFN_OFFSET. The use of ARCH_PFN_OFFSET only affects normal memory and not IO mappings. ioremap uses map_page and isn't affected by ARCH_PFN_OFFSET. /dev/mem continues to allow access to any physical address in the system regardless of how CONFIG_PHYSICAL_START is set. Signed-off-by: Kumar Gala Signed-off-by: Paul Mackerras --- arch/powerpc/Kconfig | 69 ++++++++++++++++++++++++++++++++++-- arch/powerpc/kernel/head_fsl_booke.S | 11 ++++++ arch/powerpc/kernel/prom.c | 4 +++ arch/powerpc/kernel/setup_64.c | 2 +- arch/powerpc/mm/fsl_booke_mmu.c | 2 +- arch/powerpc/mm/init_32.c | 5 ++- arch/powerpc/mm/init_64.c | 3 +- arch/powerpc/mm/mem.c | 5 +-- 8 files changed, 92 insertions(+), 9 deletions(-) (limited to 'arch') diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 4bb2e93..fdc755a 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -656,21 +656,76 @@ config LOWMEM_SIZE hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL default "0x30000000" +config RELOCATABLE + bool "Build a relocatable kernel (EXPERIMENTAL)" + depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE + help + This builds a kernel image that is capable of running at the + location the kernel is loaded at (some alignment restrictions may + exist). + + One use is for the kexec on panic case where the recovery kernel + must live at a different physical address than the primary + kernel. + + Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address + it has been loaded at and the compile time physical addresses + CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START + setting can still be useful to bootwrappers that need to know the + load location of the kernel (eg. u-boot/mkimage). + +config PAGE_OFFSET_BOOL + bool "Set custom page offset address" + depends on ADVANCED_OPTIONS + help + This option allows you to set the kernel virtual address at which + the kernel will map low memory. This can be useful in optimizing + the virtual memory layout of the system. + + Say N here unless you know what you are doing. + +config PAGE_OFFSET + hex "Virtual address of memory base" if PAGE_OFFSET_BOOL + default "0xc0000000" + config KERNEL_START_BOOL bool "Set custom kernel base address" depends on ADVANCED_OPTIONS help This option allows you to set the kernel virtual address at which - the kernel will map low memory (the kernel image will be linked at - this address). This can be useful in optimizing the virtual memory - layout of the system. + the kernel will be loaded. Normally this should match PAGE_OFFSET + however there are times (like kdump) that one might not want them + to be the same. Say N here unless you know what you are doing. config KERNEL_START hex "Virtual address of kernel base" if KERNEL_START_BOOL + default PAGE_OFFSET if PAGE_OFFSET_BOOL + default "0xc2000000" if CRASH_DUMP default "0xc0000000" +config PHYSICAL_START_BOOL + bool "Set physical address where the kernel is loaded" + depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE + help + This gives the physical address where the kernel is loaded. + + Say N here unless you know what you are doing. + +config PHYSICAL_START + hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL + default "0x02000000" if PPC_STD_MMU && CRASH_DUMP + default "0x00000000" + +config PHYSICAL_ALIGN + hex + default "0x10000000" if FSL_BOOKE + help + This value puts the alignment restrictions on physical address + where kernel is loaded and run from. Kernel is compiled for an + address which meets above alignment restriction. + config TASK_SIZE_BOOL bool "Set custom user task size" depends on ADVANCED_OPTIONS @@ -717,9 +772,17 @@ config PIN_TLB endmenu if PPC64 +config PAGE_OFFSET + hex + default "0xc000000000000000" config KERNEL_START hex + default "0xc000000002000000" if CRASH_DUMP default "0xc000000000000000" +config PHYSICAL_START + hex + default "0x02000000" if CRASH_DUMP + default "0x00000000" endif source "net/Kconfig" diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S index 4ff7441..e581524 100644 --- a/arch/powerpc/kernel/head_fsl_booke.S +++ b/arch/powerpc/kernel/head_fsl_booke.S @@ -371,6 +371,17 @@ skpinv: addi r6,r6,1 /* Increment */ bl early_init +#ifdef CONFIG_RELOCATABLE + lis r3,kernstart_addr@ha + la r3,kernstart_addr@l(r3) +#ifdef CONFIG_PHYS_64BIT + stw r23,0(r3) + stw r25,4(r3) +#else + stw r25,0(r3) +#endif +#endif + mfspr r3,SPRN_TLB1CFG andi. r3,r3,0xfff lis r4,num_tlbcam_entries@ha diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c index 3bfe783..2aefe2a 100644 --- a/arch/powerpc/kernel/prom.c +++ b/arch/powerpc/kernel/prom.c @@ -53,6 +53,7 @@ #include #include #include +#include #ifdef DEBUG #define DBG(fmt...) printk(KERN_ERR fmt) @@ -978,7 +979,10 @@ static int __init early_init_dt_scan_memory(unsigned long node, } #endif lmb_add(base, size); + + memstart_addr = min((u64)memstart_addr, base); } + return 0; } diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c index 31ada9f..153a48d 100644 --- a/arch/powerpc/kernel/setup_64.c +++ b/arch/powerpc/kernel/setup_64.c @@ -435,7 +435,7 @@ void __init setup_system(void) printk("htab_address = 0x%p\n", htab_address); printk("htab_hash_mask = 0x%lx\n", htab_hash_mask); #if PHYSICAL_START > 0 - printk("physical_start = 0x%x\n", PHYSICAL_START); + printk("physical_start = 0x%lx\n", PHYSICAL_START); #endif printk("-----------------------------------------------------\n"); diff --git a/arch/powerpc/mm/fsl_booke_mmu.c b/arch/powerpc/mm/fsl_booke_mmu.c index ada249b..ce10e2b 100644 --- a/arch/powerpc/mm/fsl_booke_mmu.c +++ b/arch/powerpc/mm/fsl_booke_mmu.c @@ -202,7 +202,7 @@ adjust_total_lowmem(void) cam_max_size = max_lowmem_size; /* adjust lowmem size to max_lowmem_size */ - ram = min(max_lowmem_size, total_lowmem); + ram = min(max_lowmem_size, (phys_addr_t)total_lowmem); /* Calculate CAM values */ __cam0 = 1UL << 2 * (__ilog2(ram) / 2); diff --git a/arch/powerpc/mm/init_32.c b/arch/powerpc/mm/init_32.c index 47325f2..578750e 100644 --- a/arch/powerpc/mm/init_32.c +++ b/arch/powerpc/mm/init_32.c @@ -59,7 +59,10 @@ DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); unsigned long total_memory; unsigned long total_lowmem; -phys_addr_t memstart_addr; +phys_addr_t memstart_addr = (phys_addr_t)~0ull; +EXPORT_SYMBOL(memstart_addr); +phys_addr_t kernstart_addr; +EXPORT_SYMBOL(kernstart_addr); phys_addr_t lowmem_end_addr; int boot_mapsize; diff --git a/arch/powerpc/mm/init_64.c b/arch/powerpc/mm/init_64.c index 698bd00..c5ac532 100644 --- a/arch/powerpc/mm/init_64.c +++ b/arch/powerpc/mm/init_64.c @@ -72,7 +72,8 @@ #warning TASK_SIZE is smaller than it needs to be. #endif -phys_addr_t memstart_addr; +phys_addr_t memstart_addr = ~0; +phys_addr_t kernstart_addr; void free_initmem(void) { diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c index 16def4d..0062e6b 100644 --- a/arch/powerpc/mm/mem.c +++ b/arch/powerpc/mm/mem.c @@ -216,7 +216,7 @@ void __init do_init_bootmem(void) unsigned long total_pages; int boot_mapsize; - max_pfn = lmb_end_of_DRAM() >> PAGE_SHIFT; + max_low_pfn = max_pfn = lmb_end_of_DRAM() >> PAGE_SHIFT; total_pages = (lmb_end_of_DRAM() - memstart_addr) >> PAGE_SHIFT; #ifdef CONFIG_HIGHMEM total_pages = total_lowmem >> PAGE_SHIFT; @@ -232,7 +232,8 @@ void __init do_init_bootmem(void) start = lmb_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE); - boot_mapsize = init_bootmem(start >> PAGE_SHIFT, total_pages); + min_low_pfn = MEMORY_START >> PAGE_SHIFT; + boot_mapsize = init_bootmem_node(NODE_DATA(0), start >> PAGE_SHIFT, min_low_pfn, max_low_pfn); /* Add active regions with valid PFNs */ for (i = 0; i < lmb.memory.cnt; i++) { -- cgit v1.1