mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-10-30 18:47:25 +00:00
b72d0db9dd
The PCI initialization in pci_subsys_init() is a mess. pci_numaq_init, pci_acpi_init, pci_visws_init and pci_legacy_init are called and each implementation checks and eventually modifies the global variable pcibios_scanned. x86_init functions allow us to do this more elegant. The pci.init function pointer is preset to pci_legacy_init. numaq, acpi and visws can modify the pointer in their early setup functions. The functions return 0 when they did the full initialization including bus scan. A non zero return value indicates that pci_legacy_init needs to be called either because the selected function failed or wants the generic bus scan in pci_legacy_init to happen (e.g. visws). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> LKML-Reference: <43F901BD926A4E43B106BF17856F07559FB80CFE@orsmsx508.amr.corp.intel.com> Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: Jacob Pan <jacob.jun.pan@intel.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
118 lines
2.8 KiB
C
118 lines
2.8 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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#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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#include <asm/x86_init.h>
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/* Interrupt control for vSMPowered x86_64 systems */
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#ifdef CONFIG_X86_64
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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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#else
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static inline void visws_early_detect(void) { }
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#endif
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extern unsigned long saved_video_mode;
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extern void reserve_standard_io_resources(void);
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extern void i386_reserve_resources(void);
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extern void setup_default_timer_irq(void);
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#ifdef CONFIG_X86_MRST
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extern void x86_mrst_early_setup(void);
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#else
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static inline void x86_mrst_early_setup(void) { }
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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." #name ":" \
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" 1:.skip %c0;" \
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" .size .brk." #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.name: \
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1: .skip sz; \
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.size .brk.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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