ipl_data.c

 1// SPDX-License-Identifier: GPL-2.0
 2
 3#include <linux/ptrace.h>
 4#include <asm/cio.h>
 5#include <asm/asm-offsets.h>
 6#include "boot.h"
 7
 8#define CCW0(cmd, addr, cnt, flg) \
 9	{ .cmd_code = cmd, .cda = addr, .count = cnt, .flags = flg, }
10
11#define PSW_MASK_DISABLED (PSW_MASK_WAIT | PSW_MASK_EA | PSW_MASK_BA)
12
13struct ipl_lowcore {
14	psw32_t		ipl_psw;			/* 0x0000 */
15	struct ccw0	ccwpgm[2];			/* 0x0008 */
16	u8		fill[56];			/* 0x0018 */
17	struct ccw0	ccwpgmcc[20];			/* 0x0050 */
18	u8		pad_0xf0[0x0140-0x00f0];	/* 0x00f0 */
19	psw_t		svc_old_psw;			/* 0x0140 */
20	u8		pad_0x150[0x01a0-0x0150];	/* 0x0150 */
21	psw_t		restart_psw;			/* 0x01a0 */
22	psw_t		external_new_psw;		/* 0x01b0 */
23	psw_t		svc_new_psw;			/* 0x01c0 */
24	psw_t		program_new_psw;		/* 0x01d0 */
25	psw_t		mcck_new_psw;			/* 0x01e0 */
26	psw_t		io_new_psw;			/* 0x01f0 */
27};
28
29/*
30 * Initial lowcore for IPL: the first 24 bytes are loaded by IPL to
31 * addresses 0-23 (a PSW and two CCWs). Bytes 24-79 are discarded.
32 * The next 160 bytes are loaded to addresses 0x18-0xb7. They form
33 * the continuation of the CCW program started by IPL and load the
34 * range 0x0f0-0x730 from the image to the range 0x0f0-0x730 in
35 * memory. At the end of the channel program the PSW at location 0 is
36 * loaded.
37 * Initial processing starts at 0x200 = iplstart.
38 *
39 * The restart psw points to iplstart which allows to load a kernel
40 * image into memory and starting it by a psw restart on any cpu. All
41 * other default psw new locations contain a disabled wait psw where
42 * the address indicates which psw was loaded.
43 *
44 * Note that the 'file' utility can detect s390 kernel images. For
45 * that to succeed the two initial CCWs, and the 0x40 fill bytes must
46 * be present.
47 */
48static struct ipl_lowcore ipl_lowcore __used __section(".ipldata") = {
49	.ipl_psw = { .mask = PSW32_MASK_BASE, .addr = PSW32_ADDR_AMODE | IPL_START },
50	.ccwpgm = {
51		[ 0] = CCW0(CCW_CMD_READ_IPL, 0x018, 0x50, CCW_FLAG_SLI | CCW_FLAG_CC),
52		[ 1] = CCW0(CCW_CMD_READ_IPL, 0x068, 0x50, CCW_FLAG_SLI | CCW_FLAG_CC),
53	},
54	.fill = {
55		[ 0 ... 55] = 0x40,
56	},
57	.ccwpgmcc = {
58		[ 0] = CCW0(CCW_CMD_READ_IPL, 0x0f0, 0x50, CCW_FLAG_SLI | CCW_FLAG_CC),
59		[ 1] = CCW0(CCW_CMD_READ_IPL, 0x140, 0x50, CCW_FLAG_SLI | CCW_FLAG_CC),
60		[ 2] = CCW0(CCW_CMD_READ_IPL, 0x190, 0x50, CCW_FLAG_SLI | CCW_FLAG_CC),
61		[ 3] = CCW0(CCW_CMD_READ_IPL, 0x1e0, 0x50, CCW_FLAG_SLI | CCW_FLAG_CC),
62		[ 4] = CCW0(CCW_CMD_READ_IPL, 0x230, 0x50, CCW_FLAG_SLI | CCW_FLAG_CC),
63		[ 5] = CCW0(CCW_CMD_READ_IPL, 0x280, 0x50, CCW_FLAG_SLI | CCW_FLAG_CC),
64		[ 6] = CCW0(CCW_CMD_READ_IPL, 0x2d0, 0x50, CCW_FLAG_SLI | CCW_FLAG_CC),
65		[ 7] = CCW0(CCW_CMD_READ_IPL, 0x320, 0x50, CCW_FLAG_SLI | CCW_FLAG_CC),
66		[ 8] = CCW0(CCW_CMD_READ_IPL, 0x370, 0x50, CCW_FLAG_SLI | CCW_FLAG_CC),
67		[ 9] = CCW0(CCW_CMD_READ_IPL, 0x3c0, 0x50, CCW_FLAG_SLI | CCW_FLAG_CC),
68		[10] = CCW0(CCW_CMD_READ_IPL, 0x410, 0x50, CCW_FLAG_SLI | CCW_FLAG_CC),
69		[11] = CCW0(CCW_CMD_READ_IPL, 0x460, 0x50, CCW_FLAG_SLI | CCW_FLAG_CC),
70		[12] = CCW0(CCW_CMD_READ_IPL, 0x4b0, 0x50, CCW_FLAG_SLI | CCW_FLAG_CC),
71		[13] = CCW0(CCW_CMD_READ_IPL, 0x500, 0x50, CCW_FLAG_SLI | CCW_FLAG_CC),
72		[14] = CCW0(CCW_CMD_READ_IPL, 0x550, 0x50, CCW_FLAG_SLI | CCW_FLAG_CC),
73		[15] = CCW0(CCW_CMD_READ_IPL, 0x5a0, 0x50, CCW_FLAG_SLI | CCW_FLAG_CC),
74		[16] = CCW0(CCW_CMD_READ_IPL, 0x5f0, 0x50, CCW_FLAG_SLI | CCW_FLAG_CC),
75		[17] = CCW0(CCW_CMD_READ_IPL, 0x640, 0x50, CCW_FLAG_SLI | CCW_FLAG_CC),
76		[18] = CCW0(CCW_CMD_READ_IPL, 0x690, 0x50, CCW_FLAG_SLI | CCW_FLAG_CC),
77		[19] = CCW0(CCW_CMD_READ_IPL, 0x6e0, 0x50, CCW_FLAG_SLI),
78	},
79	/*
80	 * Let the GDB's lx-symbols command find the jump_to_kernel symbol
81	 * without having to load decompressor symbols.
82	 */
83	.svc_old_psw	  = { .mask = 0, .addr = (unsigned long)jump_to_kernel },
84	.restart_psw	  = { .mask = 0, .addr = IPL_START, },
85	.external_new_psw = { .mask = PSW_MASK_DISABLED, .addr = __LC_EXT_NEW_PSW, },
86	.svc_new_psw	  = { .mask = PSW_MASK_DISABLED, .addr = __LC_SVC_NEW_PSW, },
87	.program_new_psw  = { .mask = PSW_MASK_DISABLED, .addr = __LC_PGM_NEW_PSW, },
88	.mcck_new_psw	  = { .mask = PSW_MASK_DISABLED, .addr = __LC_MCK_NEW_PSW, },
89	.io_new_psw	  = { .mask = PSW_MASK_DISABLED, .addr = __LC_IO_NEW_PSW, },
90};