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The Intel SIPI (start-up inter-processor interrupt) vector is the entry point for each secondary CPU (also called an AP - applications processor). The assembler and C code are linked, so add comments to indicate this. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
/*
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* Copyright (c) 2015 Gooogle, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef _ASM_SIPI_H
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#define _ASM_SIPI_H
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#define AP_DEFAULT_BASE 0x30000
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#define AP_DEFAULT_SIZE 0x10000
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#ifndef __ASSEMBLER__
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/**
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* struct sipi_params_16bit - 16-bit SIPI entry-point parameters
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*
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* These are set up in the same space as the SIPI 16-bit code so that each AP
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* can access the parameters when it boots.
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*
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* Each of these must be set up for the AP to boot, except @segment which is
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* set in the assembly code.
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*
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* @ap_start: 32-bit SIPI entry point for U-Boot
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* @segment: Code segment for U-Boot
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* @pad: Padding (not used)
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* @gdt_limit: U-Boot GDT limit (X86_GDT_SIZE - 1)
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* @gdt: U-Boot GDT (gd->arch.gdt)
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* @unused: Not used
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*/
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struct __packed sipi_params_16bit {
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u32 ap_start;
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u16 segment;
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u16 pad;
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u16 gdt_limit;
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u32 gdt;
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u16 unused;
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};
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/**
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* struct sipi_params - 32-bit SIP entry-point parameters
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*
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* These are used by the AP init code and must be set up before the APs start.
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* The members must match with the sipi_params layout in sipi_vector.S.
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*
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* The stack area extends down from @stack_top, with @stack_size allocated
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* for each AP.
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*
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* @idt_ptr: Interrupt descriptor table pointer
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* @stack_top: Top of the AP stack area
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* @stack_size: Size of each AP's stack
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* @microcode_lock: Used to ensure only one AP loads microcode at once
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* 0xffffffff enables parallel loading.
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* @microcode_ptr: Pointer to microcode, or 0 if none
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* @msr_table_ptr: Pointer to saved MSRs, a list of struct saved_msr
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* @msr_count: Number of saved MSRs
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* @c_handler: C function to call once early init is complete
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* @ap_count: Shared atomic value to allocate CPU indexes
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*/
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struct sipi_params {
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u32 idt_ptr;
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u32 stack_top;
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u32 stack_size;
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u32 microcode_lock;
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u32 microcode_ptr;
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u32 msr_table_ptr;
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u32 msr_count;
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u32 c_handler;
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atomic_t ap_count;
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};
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/* 16-bit AP entry point */
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void ap_start16(void);
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/* end of 16-bit code/data, marks the region to be copied to SIP vector */
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void ap_start16_code_end(void);
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/* 32-bit AP entry point */
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void ap_start(void);
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extern char sipi_params_16bit[];
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extern char sipi_params[];
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#endif /* __ASSEMBLER__ */
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#endif
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