796216a57f
Impact: new interface; remove hard-coded limit Add RESERVE_BRK(name, size) macro to reserve space in the brk area. This should be a conservative (ie, larger) estimate of how much space might possibly be required from the brk area. Any unused space will be freed, so there's no real downside on making the reservation too large (within limits). The name should be unique within a given file, and somewhat descriptive. The C definition of RESERVE_BRK() ends up being more complex than one would expect to work around a cluster of gcc infelicities: The first attempt was to simply try putting __section(.brk_reservation) on a variable. This doesn't work because it ends up making it a @progbits section, which gets actual space allocated in the vmlinux executable. The second attempt was to emit the space into a section using asm, but gcc doesn't allow arguments to be passed to file-level asm() statements, making it hard to pass in the size. The final attempt is to wrap the asm() in a function to allow it to have arguments, and put the function itself into the .discard section, which vmlinux*.lds drops entirely from the emitted vmlinux. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
152 lines
3.7 KiB
C
152 lines
3.7 KiB
C
#ifndef _ASM_X86_SETUP_H
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#define _ASM_X86_SETUP_H
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#ifdef __KERNEL__
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#define COMMAND_LINE_SIZE 2048
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#ifndef __ASSEMBLY__
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/*
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* Any setup quirks to be performed?
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*/
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struct mpc_cpu;
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struct mpc_bus;
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struct mpc_oemtable;
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struct x86_quirks {
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int (*arch_pre_time_init)(void);
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int (*arch_time_init)(void);
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int (*arch_pre_intr_init)(void);
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int (*arch_intr_init)(void);
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int (*arch_trap_init)(void);
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char * (*arch_memory_setup)(void);
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int (*mach_get_smp_config)(unsigned int early);
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int (*mach_find_smp_config)(unsigned int reserve);
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int *mpc_record;
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int (*mpc_apic_id)(struct mpc_cpu *m);
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void (*mpc_oem_bus_info)(struct mpc_bus *m, char *name);
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void (*mpc_oem_pci_bus)(struct mpc_bus *m);
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void (*smp_read_mpc_oem)(struct mpc_oemtable *oemtable,
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unsigned short oemsize);
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int (*setup_ioapic_ids)(void);
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};
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extern void x86_quirk_pre_intr_init(void);
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extern void x86_quirk_intr_init(void);
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extern void x86_quirk_trap_init(void);
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extern void x86_quirk_pre_time_init(void);
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extern void x86_quirk_time_init(void);
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#endif /* __ASSEMBLY__ */
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#ifdef __i386__
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#include <linux/pfn.h>
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/*
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* Reserved space for vmalloc and iomap - defined in asm/page.h
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*/
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#define MAXMEM_PFN PFN_DOWN(MAXMEM)
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#define MAX_NONPAE_PFN (1 << 20)
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#endif /* __i386__ */
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#define PARAM_SIZE 4096 /* sizeof(struct boot_params) */
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#define OLD_CL_MAGIC 0xA33F
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#define OLD_CL_ADDRESS 0x020 /* Relative to real mode data */
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#define NEW_CL_POINTER 0x228 /* Relative to real mode data */
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#ifndef __ASSEMBLY__
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#include <asm/bootparam.h>
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/* Interrupt control for vSMPowered x86_64 systems */
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#ifdef CONFIG_X86_VSMP
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void vsmp_init(void);
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#else
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static inline void vsmp_init(void) { }
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#endif
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void setup_bios_corruption_check(void);
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#ifdef CONFIG_X86_VISWS
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extern void visws_early_detect(void);
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extern int is_visws_box(void);
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#else
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static inline void visws_early_detect(void) { }
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static inline int is_visws_box(void) { return 0; }
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#endif
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extern struct x86_quirks *x86_quirks;
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extern unsigned long saved_video_mode;
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#ifndef CONFIG_PARAVIRT
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#define paravirt_post_allocator_init() do {} while (0)
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#endif
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#ifndef _SETUP
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/*
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* This is set up by the setup-routine at boot-time
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*/
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extern struct boot_params boot_params;
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/*
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* Do NOT EVER look at the BIOS memory size location.
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* It does not work on many machines.
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*/
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#define LOWMEMSIZE() (0x9f000)
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/* exceedingly early brk-like allocator */
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extern unsigned long _brk_end;
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void *extend_brk(size_t size, size_t align);
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/*
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* Reserve space in the brk section. The name must be unique within
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* the file, and somewhat descriptive. The size is in bytes. Must be
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* used at file scope.
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*
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* (This uses a temp function to wrap the asm so we can pass it the
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* size parameter; otherwise we wouldn't be able to. We can't use a
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* "section" attribute on a normal variable because it always ends up
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* being @progbits, which ends up allocating space in the vmlinux
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* executable.)
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*/
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#define RESERVE_BRK(name,sz) \
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static void __section(.discard) __used \
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__brk_reservation_fn_##name##__(void) { \
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asm volatile ( \
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".pushsection .brk_reservation,\"aw\",@nobits;" \
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"__brk_reservation_" #name "__:" \
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" 1:.skip %c0;" \
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" .size __brk_reservation_" #name "__, . - 1b;" \
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" .popsection" \
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: : "i" (sz)); \
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}
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#ifdef __i386__
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void __init i386_start_kernel(void);
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extern void probe_roms(void);
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#else
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void __init x86_64_start_kernel(char *real_mode);
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void __init x86_64_start_reservations(char *real_mode_data);
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#endif /* __i386__ */
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#endif /* _SETUP */
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#else
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#define RESERVE_BRK(name,sz) \
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.pushsection .brk_reservation,"aw",@nobits; \
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__brk_reservation_##name##__: \
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1: .skip sz; \
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.size __brk_reservation_##name##__,.-1b; \
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.popsection
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#endif /* __ASSEMBLY__ */
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#endif /* __KERNEL__ */
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#endif /* _ASM_X86_SETUP_H */
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