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/*
* S390 Basic Architecture
*
* Copyright (c) 2019 Jason J. Herne <jjherne@us.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or (at
* your option) any later version. See the COPYING file in the top-level
* directory.
*/
#ifndef S390_ARCH_H
#define S390_ARCH_H
typedef struct PSW {
uint64_t mask;
uint64_t addr;
} __attribute__ ((aligned(8))) PSW;
_Static_assert(sizeof(struct PSW) == 16, "PSW size incorrect");
/* Older PSW format used by LPSW instruction */
typedef struct PSWLegacy {
uint32_t mask;
uint32_t addr;
} __attribute__ ((aligned(8))) PSWLegacy;
_Static_assert(sizeof(struct PSWLegacy) == 8, "PSWLegacy size incorrect");
/* s390 psw bit masks */
#define PSW_MASK_IOINT 0x0200000000000000ULL
#define PSW_MASK_SHORTPSW 0x0008000000000000ULL
#define PSW_MASK_WAIT 0x0002000000000000ULL
#define PSW_MASK_EAMODE 0x0000000100000000ULL
#define PSW_MASK_BAMODE 0x0000000080000000ULL
#define PSW_MASK_SHORT_ADDR 0x000000007fffffffULL
#define PSW_MASK_64 (PSW_MASK_EAMODE | PSW_MASK_BAMODE)
/* Low core mapping */
typedef struct LowCore {
/* prefix area: defined by architecture */
PSWLegacy ipl_psw; /* 0x000 */
uint32_t ccw1[2]; /* 0x008 */
union {
uint32_t ccw2[2]; /* 0x010 */
struct {
uint32_t reserved10;
uint32_t ptr_iplb;
};
};
uint8_t pad1[0x80 - 0x18]; /* 0x018 */
uint32_t ext_params; /* 0x080 */
uint16_t cpu_addr; /* 0x084 */
uint16_t ext_int_code; /* 0x086 */
uint16_t svc_ilen; /* 0x088 */
uint16_t svc_code; /* 0x08a */
uint16_t pgm_ilen; /* 0x08c */
uint16_t pgm_code; /* 0x08e */
uint32_t data_exc_code; /* 0x090 */
uint16_t mon_class_num; /* 0x094 */
uint16_t per_perc_atmid; /* 0x096 */
uint64_t per_address; /* 0x098 */
uint8_t exc_access_id; /* 0x0a0 */
uint8_t per_access_id; /* 0x0a1 */
uint8_t op_access_id; /* 0x0a2 */
uint8_t ar_access_id; /* 0x0a3 */
uint8_t pad2[0xA8 - 0xA4]; /* 0x0a4 */
uint64_t trans_exc_code; /* 0x0a8 */
uint64_t monitor_code; /* 0x0b0 */
uint16_t subchannel_id; /* 0x0b8 */
uint16_t subchannel_nr; /* 0x0ba */
uint32_t io_int_parm; /* 0x0bc */
uint32_t io_int_word; /* 0x0c0 */
uint8_t pad3[0xc8 - 0xc4]; /* 0x0c4 */
uint32_t stfl_fac_list; /* 0x0c8 */
uint8_t pad4[0xe8 - 0xcc]; /* 0x0cc */
uint64_t mcic; /* 0x0e8 */
uint8_t pad5[0xf4 - 0xf0]; /* 0x0f0 */
uint32_t external_damage_code; /* 0x0f4 */
uint64_t failing_storage_address; /* 0x0f8 */
uint8_t pad6[0x110 - 0x100]; /* 0x100 */
uint64_t per_breaking_event_addr; /* 0x110 */
uint8_t pad7[0x120 - 0x118]; /* 0x118 */
PSW restart_old_psw; /* 0x120 */
PSW external_old_psw; /* 0x130 */
PSW svc_old_psw; /* 0x140 */
PSW program_old_psw; /* 0x150 */
PSW mcck_old_psw; /* 0x160 */
PSW io_old_psw; /* 0x170 */
uint8_t pad8[0x1a0 - 0x180]; /* 0x180 */
PSW restart_new_psw; /* 0x1a0 */
PSW external_new_psw; /* 0x1b0 */
PSW svc_new_psw; /* 0x1c0 */
PSW program_new_psw; /* 0x1d0 */
PSW mcck_new_psw; /* 0x1e0 */
PSW io_new_psw; /* 0x1f0 */
} __attribute__((packed, aligned(8192))) LowCore;
extern LowCore *lowcore;
/* Location of "S390EP" in a Linux binary (see arch/s390/boot/head.S) */
#define S390EP 0x10008
static inline void set_prefix(uint32_t address)
{
asm volatile("spx %0" : : "m" (address) : "memory");
}
static inline uint32_t store_prefix(void)
{
uint32_t address;
asm volatile("stpx %0" : "=m" (address));
return address;
}
#endif
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