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};
91

source code of linux/arch/s390/boot/ipl_data.c