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6067891b65
The early boot code contains various open-coded inline assemblies with exception handling. In order to handle possible exceptions each of them changes the program check new psw, and restores it. In order to simplify the various inline assemblies add simple exception table support: the program check handler is called with a fully populated pt_regs on the stack and may change the psw and register members. When the program check handler returns the psw and registers from pt_regs will be used to continue execution. The program check handler searches the exception table for an entry which matches the address of the program check. If such an entry is found the psw address within pt_regs on the stack is replaced with a fixup address, and execution continues at the new address. If no entry is found the psw is changed to a disabled wait psw and execution stops. Before entering the C part of the program check handler the address of the program check new psw is replaced to a minimalistic handler. This is supposed to help against program check loops. If an exception happens while in program check processing the register contents of the original exception are restored and a disabled wait psw is loaded. Acked-by: Alexander Gordeev <agordeev@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
126 lines
4.9 KiB
C
126 lines
4.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef BOOT_BOOT_H
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#define BOOT_BOOT_H
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#include <linux/types.h>
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#define IPL_START 0x200
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#ifndef __ASSEMBLY__
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#include <linux/printk.h>
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#include <asm/physmem_info.h>
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struct vmlinux_info {
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unsigned long entry;
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unsigned long image_size; /* does not include .bss */
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unsigned long bss_size; /* uncompressed image .bss size */
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unsigned long bootdata_off;
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unsigned long bootdata_size;
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unsigned long bootdata_preserved_off;
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unsigned long bootdata_preserved_size;
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unsigned long got_start;
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unsigned long got_end;
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unsigned long amode31_size;
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unsigned long init_mm_off;
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unsigned long swapper_pg_dir_off;
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unsigned long invalid_pg_dir_off;
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unsigned long alt_instructions;
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unsigned long alt_instructions_end;
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#ifdef CONFIG_KASAN
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unsigned long kasan_early_shadow_page_off;
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unsigned long kasan_early_shadow_pte_off;
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unsigned long kasan_early_shadow_pmd_off;
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unsigned long kasan_early_shadow_pud_off;
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unsigned long kasan_early_shadow_p4d_off;
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#endif
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};
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void startup_kernel(void);
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unsigned long detect_max_physmem_end(void);
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void detect_physmem_online_ranges(unsigned long max_physmem_end);
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void physmem_set_usable_limit(unsigned long limit);
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void physmem_reserve(enum reserved_range_type type, unsigned long addr, unsigned long size);
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void physmem_free(enum reserved_range_type type);
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/* for continuous/multiple allocations per type */
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unsigned long physmem_alloc_or_die(enum reserved_range_type type, unsigned long size,
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unsigned long align);
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unsigned long physmem_alloc(enum reserved_range_type type, unsigned long size,
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unsigned long align, bool die_on_oom);
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/* for single allocations, 1 per type */
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unsigned long physmem_alloc_range(enum reserved_range_type type, unsigned long size,
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unsigned long align, unsigned long min, unsigned long max,
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bool die_on_oom);
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unsigned long get_physmem_alloc_pos(void);
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void dump_physmem_reserved(void);
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bool ipl_report_certs_intersects(unsigned long addr, unsigned long size,
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unsigned long *intersection_start);
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bool is_ipl_block_dump(void);
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void store_ipl_parmblock(void);
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int read_ipl_report(void);
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void save_ipl_cert_comp_list(void);
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void setup_boot_command_line(void);
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void parse_boot_command_line(void);
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void verify_facilities(void);
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void print_missing_facilities(void);
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void sclp_early_setup_buffer(void);
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void alt_debug_setup(char *str);
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void do_pgm_check(struct pt_regs *regs);
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unsigned long randomize_within_range(unsigned long size, unsigned long align,
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unsigned long min, unsigned long max);
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void setup_vmem(unsigned long kernel_start, unsigned long kernel_end, unsigned long asce_limit);
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int __printf(1, 2) boot_printk(const char *fmt, ...);
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void print_stacktrace(unsigned long sp);
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void error(char *m);
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int get_random(unsigned long limit, unsigned long *value);
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void boot_rb_dump(void);
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#ifndef boot_fmt
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#define boot_fmt(fmt) fmt
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#endif
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#define boot_emerg(fmt, ...) boot_printk(KERN_EMERG boot_fmt(fmt), ##__VA_ARGS__)
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#define boot_alert(fmt, ...) boot_printk(KERN_ALERT boot_fmt(fmt), ##__VA_ARGS__)
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#define boot_crit(fmt, ...) boot_printk(KERN_CRIT boot_fmt(fmt), ##__VA_ARGS__)
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#define boot_err(fmt, ...) boot_printk(KERN_ERR boot_fmt(fmt), ##__VA_ARGS__)
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#define boot_warn(fmt, ...) boot_printk(KERN_WARNING boot_fmt(fmt), ##__VA_ARGS__)
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#define boot_notice(fmt, ...) boot_printk(KERN_NOTICE boot_fmt(fmt), ##__VA_ARGS__)
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#define boot_info(fmt, ...) boot_printk(KERN_INFO boot_fmt(fmt), ##__VA_ARGS__)
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#define boot_debug(fmt, ...) boot_printk(KERN_DEBUG boot_fmt(fmt), ##__VA_ARGS__)
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extern struct machine_info machine;
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extern int boot_console_loglevel;
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extern bool boot_ignore_loglevel;
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/* Symbols defined by linker scripts */
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extern const char kernel_version[];
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extern unsigned long memory_limit;
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extern unsigned long vmalloc_size;
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extern int vmalloc_size_set;
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extern char __boot_data_start[], __boot_data_end[];
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extern char __boot_data_preserved_start[], __boot_data_preserved_end[];
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extern char __vmlinux_relocs_64_start[], __vmlinux_relocs_64_end[];
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extern char _decompressor_syms_start[], _decompressor_syms_end[];
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extern char _stack_start[], _stack_end[];
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extern char _end[], _decompressor_end[];
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extern unsigned char _compressed_start[];
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extern unsigned char _compressed_end[];
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extern struct vmlinux_info _vmlinux_info;
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#define vmlinux _vmlinux_info
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#define __lowcore_pa(x) ((unsigned long)(x) % sizeof(struct lowcore))
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#define __abs_lowcore_pa(x) (((unsigned long)(x) - __abs_lowcore) % sizeof(struct lowcore))
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#define __kernel_va(x) ((void *)((unsigned long)(x) - __kaslr_offset_phys + __kaslr_offset))
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#define __kernel_pa(x) ((unsigned long)(x) - __kaslr_offset + __kaslr_offset_phys)
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#define __identity_va(x) ((void *)((unsigned long)(x) + __identity_base))
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#define __identity_pa(x) ((unsigned long)(x) - __identity_base)
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static inline bool intersects(unsigned long addr0, unsigned long size0,
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unsigned long addr1, unsigned long size1)
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{
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return addr0 + size0 > addr1 && addr1 + size1 > addr0;
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}
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#endif /* __ASSEMBLY__ */
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#endif /* BOOT_BOOT_H */
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