fce0d57403
This patch implements the kexec support for ppc64 platforms.
A couple of notes:
1) We copy the pages in virtual mode, using the full base kernel
and a statically allocated stack. At kexec_prepare time we
scan the pages and if any overlap our (0, _end[]) range we
return -ETXTBSY.
On PowerPC 64 systems running in LPAR (logical partitioning)
mode, only a small region of memory, referred to as the RMO,
can be accessed in real mode. Since Linux runs with only one
zone of memory in the memory allocator, and it can be orders of
magnitude more memory than the RMO, looping until we allocate
pages in the source region is not feasible. Copying in virtual
means we don't have to write a hash table generation and call
hypervisor to insert translations, instead we rely on the pinned
kernel linear mapping. The kernel already has move to linked
location built in, so there is no requirement to load it at 0.
If we want to load something other than a kernel, then a stub
can be written to copy a linear chunk in real mode.
2) The start entry point gets passed parameters from the kernel.
Slaves are started at a fixed address after copying code from
the entry point.
All CPUs get passed their firmware assigned physical id in r3
(most calling conventions use this register for the first
argument).
This is used to distinguish each CPU from all other CPUs.
Since firmware is not around, there is no other way to obtain
this information other than to pass it somewhere.
A single CPU, referred to here as the master and the one executing
the kexec call, branches to start with the address of start in r4.
While this can be calculated, we have to load it through a gpr to
branch to this point so defining the register this is contained
in is free. A stack of unspecified size is available at r1
(also common calling convention).
All remaining running CPUs are sent to start at absolute address
0x60 after copying the first 0x100 bytes from start to address 0.
This convention was chosen because it matches what the kernel
has been doing itself. (only gpr3 is defined).
Note: This is not quite the convention of the kexec bootblock v2
in the kernel. A stub has been written to convert between them,
and we may adjust the kernel in the future to allow this directly
without any stub.
3) Destination pages can be placed anywhere, even where they
would not be accessible in real mode. This will allow us to
place ram disks above the RMO if we choose.
Signed-off-by: Milton Miller <miltonm@bga.com>
Signed-off-by: R Sharada <sharada@in.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
187 lines
5.3 KiB
C
187 lines
5.3 KiB
C
#ifdef __KERNEL__
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#ifndef _PPC64_MACHDEP_H
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#define _PPC64_MACHDEP_H
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/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/config.h>
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#include <linux/seq_file.h>
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#include <linux/init.h>
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#include <linux/dma-mapping.h>
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#include <asm/setup.h>
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struct pt_regs;
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struct pci_bus;
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struct device_node;
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struct iommu_table;
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struct rtc_time;
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struct file;
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#ifdef CONFIG_SMP
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struct smp_ops_t {
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void (*message_pass)(int target, int msg);
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int (*probe)(void);
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void (*kick_cpu)(int nr);
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void (*setup_cpu)(int nr);
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void (*take_timebase)(void);
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void (*give_timebase)(void);
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int (*cpu_enable)(unsigned int nr);
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int (*cpu_disable)(void);
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void (*cpu_die)(unsigned int nr);
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int (*cpu_bootable)(unsigned int nr);
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};
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#endif
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struct machdep_calls {
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void (*hpte_invalidate)(unsigned long slot,
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unsigned long va,
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int large,
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int local);
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long (*hpte_updatepp)(unsigned long slot,
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unsigned long newpp,
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unsigned long va,
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int large,
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int local);
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void (*hpte_updateboltedpp)(unsigned long newpp,
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unsigned long ea);
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long (*hpte_insert)(unsigned long hpte_group,
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unsigned long va,
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unsigned long prpn,
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int secondary,
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unsigned long hpteflags,
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int bolted,
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int large);
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long (*hpte_remove)(unsigned long hpte_group);
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void (*flush_hash_range)(unsigned long context,
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unsigned long number,
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int local);
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/* special for kexec, to be called in real mode, linar mapping is
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* destroyed as well */
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void (*hpte_clear_all)(void);
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void (*tce_build)(struct iommu_table * tbl,
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long index,
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long npages,
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unsigned long uaddr,
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enum dma_data_direction direction);
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void (*tce_free)(struct iommu_table *tbl,
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long index,
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long npages);
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void (*tce_flush)(struct iommu_table *tbl);
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void (*iommu_dev_setup)(struct pci_dev *dev);
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void (*iommu_bus_setup)(struct pci_bus *bus);
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void (*irq_bus_setup)(struct pci_bus *bus);
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int (*probe)(int platform);
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void (*setup_arch)(void);
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void (*init_early)(void);
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/* Optional, may be NULL. */
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void (*get_cpuinfo)(struct seq_file *m);
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void (*init_IRQ)(void);
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int (*get_irq)(struct pt_regs *);
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void (*cpu_irq_down)(void);
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/* PCI stuff */
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void (*pcibios_fixup)(void);
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void (*restart)(char *cmd);
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void (*power_off)(void);
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void (*halt)(void);
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void (*panic)(char *str);
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void (*cpu_die)(void);
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int (*set_rtc_time)(struct rtc_time *);
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void (*get_rtc_time)(struct rtc_time *);
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void (*get_boot_time)(struct rtc_time *);
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void (*calibrate_decr)(void);
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void (*progress)(char *, unsigned short);
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/* Debug interface. Low level I/O to some terminal device */
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void (*udbg_putc)(unsigned char c);
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unsigned char (*udbg_getc)(void);
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int (*udbg_getc_poll)(void);
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/* Interface for platform error logging */
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void (*log_error)(char *buf, unsigned int err_type, int fatal);
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ssize_t (*nvram_write)(char *buf, size_t count, loff_t *index);
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ssize_t (*nvram_read)(char *buf, size_t count, loff_t *index);
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ssize_t (*nvram_size)(void);
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int (*nvram_sync)(void);
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/* Exception handlers */
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void (*system_reset_exception)(struct pt_regs *regs);
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int (*machine_check_exception)(struct pt_regs *regs);
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/* Motherboard/chipset features. This is a kind of general purpose
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* hook used to control some machine specific features (like reset
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* lines, chip power control, etc...).
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*/
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long (*feature_call)(unsigned int feature, ...);
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/* Check availability of legacy devices like i8042 */
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int (*check_legacy_ioport)(unsigned int baseport);
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/* Get legacy PCI/IDE interrupt mapping */
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int (*pci_get_legacy_ide_irq)(struct pci_dev *dev, int channel);
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/* Get access protection for /dev/mem */
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pgprot_t (*phys_mem_access_prot)(struct file *file,
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unsigned long offset,
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unsigned long size,
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pgprot_t vma_prot);
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};
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extern struct machdep_calls ppc_md;
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extern char cmd_line[COMMAND_LINE_SIZE];
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#ifdef CONFIG_PPC_PMAC
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/*
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* Power macintoshes have either a CUDA, PMU or SMU controlling
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* system reset, power, NVRAM, RTC.
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*/
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typedef enum sys_ctrler_kind {
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SYS_CTRLER_UNKNOWN = 0,
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SYS_CTRLER_CUDA = 1,
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SYS_CTRLER_PMU = 2,
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SYS_CTRLER_SMU = 3,
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} sys_ctrler_t;
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extern sys_ctrler_t sys_ctrler;
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#endif /* CONFIG_PPC_PMAC */
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/* Functions to produce codes on the leds.
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* The SRC code should be unique for the message category and should
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* be limited to the lower 24 bits (the upper 8 are set by these funcs),
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* and (for boot & dump) should be sorted numerically in the order
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* the events occur.
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*/
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/* Print a boot progress message. */
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void ppc64_boot_msg(unsigned int src, const char *msg);
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/* Print a termination message (print only -- does not stop the kernel) */
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void ppc64_terminate_msg(unsigned int src, const char *msg);
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/* Print something that needs attention (device error, etc) */
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void ppc64_attention_msg(unsigned int src, const char *msg);
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/* Print a dump progress message. */
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void ppc64_dump_msg(unsigned int src, const char *msg);
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static inline void log_error(char *buf, unsigned int err_type, int fatal)
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{
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if (ppc_md.log_error)
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ppc_md.log_error(buf, err_type, fatal);
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}
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#endif /* _PPC64_MACHDEP_H */
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#endif /* __KERNEL__ */
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