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1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3  * Copyright (c) 2015 Gooogle, Inc
4  * Written by Simon Glass <sjg@chromium.org>
5  */
6 
7 #ifndef _ASM_SIPI_H
8 #define _ASM_SIPI_H
9 
10 #define AP_DEFAULT_BASE 0x30000
11 #define AP_DEFAULT_SIZE 0x10000
12 
13 #ifndef __ASSEMBLER__
14 
15 /**
16  * struct sipi_params_16bit - 16-bit SIPI entry-point parameters
17  *
18  * These are set up in the same space as the SIPI 16-bit code so that each AP
19  * can access the parameters when it boots.
20  *
21  * Each of these must be set up for the AP to boot, except @segment which is
22  * set in the assembly code.
23  *
24  * @ap_start:		32-bit SIPI entry point for U-Boot
25  * @segment:		Code segment for U-Boot
26  * @pad:		Padding (not used)
27  * @gdt_limit:		U-Boot GDT limit (X86_GDT_SIZE - 1)
28  * @gdt:		U-Boot GDT (gd->arch.gdt)
29  * @unused:		Not used
30  */
31 struct __packed sipi_params_16bit {
32 	u32 ap_start;
33 	u16 segment;
34 	u16 pad;
35 	u16 gdt_limit;
36 	u32 gdt;
37 	u16 unused;
38 };
39 
40 /**
41  * struct sipi_params - 32-bit SIP entry-point parameters
42  *
43  * These are used by the AP init code and must be set up before the APs start.
44  * The members must match with the sipi_params layout in sipi_vector.S.
45  *
46  * The stack area extends down from @stack_top, with @stack_size allocated
47  * for each AP.
48  *
49  * @idt_ptr:		Interrupt descriptor table pointer
50  * @stack_top:		Top of the AP stack area
51  * @stack_size:		Size of each AP's stack
52  * @microcode_lock:	Used to ensure only one AP loads microcode at once
53  *			0xffffffff enables parallel loading.
54  * @microcode_ptr:	Pointer to microcode, or 0 if none
55  * @msr_table_ptr:	Pointer to saved MSRs, a list of struct saved_msr
56  * @msr_count:		Number of saved MSRs
57  * @c_handler:		C function to call once early init is complete
58  * @ap_count:		Shared atomic value to allocate CPU indexes
59  */
60 struct sipi_params {
61 	u32 idt_ptr;
62 	u32 stack_top;
63 	u32 stack_size;
64 	u32 microcode_lock;
65 	u32 microcode_ptr;
66 	u32 msr_table_ptr;
67 	u32 msr_count;
68 	u32 c_handler;
69 	atomic_t ap_count;
70 };
71 
72 /* 16-bit AP entry point */
73 void ap_start16(void);
74 
75 /* end of 16-bit code/data, marks the region to be copied to SIP vector */
76 void ap_start16_code_end(void);
77 
78 /* 32-bit AP entry point */
79 void ap_start(void);
80 
81 extern char sipi_params_16bit[];
82 extern char sipi_params[];
83 
84 #endif /* __ASSEMBLER__ */
85 
86 #endif
87