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Diffstat (limited to 'arch/x86/include/asm/sipi.h')
-rw-r--r-- | arch/x86/include/asm/sipi.h | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/arch/x86/include/asm/sipi.h b/arch/x86/include/asm/sipi.h new file mode 100644 index 0000000..25d7d31 --- /dev/null +++ b/arch/x86/include/asm/sipi.h @@ -0,0 +1,86 @@ +/* + * Copyright (c) 2015 Gooogle, Inc + * Written by Simon Glass <sjg@chromium.org> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef _ASM_SIPI_H +#define _ASM_SIPI_H + +#define AP_DEFAULT_BASE 0x30000 +#define AP_DEFAULT_SIZE 0x10000 + +#ifndef __ASSEMBLER__ + +/** + * struct sipi_params_16bit - 16-bit SIPI entry-point parameters + * + * These are set up in the same space as the SIPI 16-bit code so that each AP + * can access the parameters when it boots. + * + * Each of these must be set up for the AP to boot, except @segment which is + * set in the assembly code. + * + * @ap_start: 32-bit SIPI entry point for U-Boot + * @segment: Code segment for U-Boot + * @pad: Padding (not used) + * @gdt_limit: U-Boot GDT limit (X86_GDT_SIZE - 1) + * @gdt: U-Boot GDT (gd->arch.gdt) + * @unused: Not used + */ +struct __packed sipi_params_16bit { + u32 ap_start; + u16 segment; + u16 pad; + u16 gdt_limit; + u32 gdt; + u16 unused; +}; + +/** + * struct sipi_params - 32-bit SIP entry-point parameters + * + * These are used by the AP init code and must be set up before the APs start. + * + * The stack area extends down from @stack_top, with @stack_size allocated + * for each AP. + * + * @idt_ptr: Interrupt descriptor table pointer + * @stack_top: Top of the AP stack area + * @stack_size: Size of each AP's stack + * @microcode_lock: Used to ensure only one AP loads microcode at once + * 0xffffffff enables parallel loading. + * @microcode_ptr: Pointer to microcode, or 0 if none + * @msr_table_ptr: Pointer to saved MSRs, a list of struct saved_msr + * @msr_count: Number of saved MSRs + * @c_handler: C function to call once early init is complete + * @ap_count: Shared atomic value to allocate CPU indexes + */ +struct sipi_params { + u32 idt_ptr; + u32 stack_top; + u32 stack_size; + u32 microcode_lock; + u32 microcode_ptr; + u32 msr_table_ptr; + u32 msr_count; + u32 c_handler; + atomic_t ap_count; +}; + +/* 16-bit AP entry point */ +void ap_start16(void); + +/* end of 16-bit code/data, marks the region to be copied to SIP vector */ +void ap_start16_code_end(void); + +/* 32-bit AP entry point */ +void ap_start(void); + +extern char sipi_params_16bit[]; +extern char sipi_params[]; + +#endif /* __ASSEMBLER__ */ + +#endif |