679196a646
When compiling the s390-ccw bios with Clang, the compiler emits a warning:
pc-bios/s390-ccw/main.c:210:5: warning: variable 'found' is used uninitialized
whenever switch default is taken [-Wsometimes-uninitialized]
default:
^~~~~~~
pc-bios/s390-ccw/main.c:214:16: note: uninitialized use occurs here
IPL_assert(found, "Boot device not found\n");
^~~~~
It's a false positive, it only happens because Clang is not smart enough
to see that the panic() function in the "default:" case can never return.
Anyway, let's explicitely mark panic() with "noreturn" to shut up the
warning.
Message-Id: <20210502174836.838816-2-thuth@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
184 lines
4.3 KiB
C
184 lines
4.3 KiB
C
/*
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* S390 CCW boot loader
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*
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* Copyright (c) 2013 Alexander Graf <agraf@suse.de>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or (at
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* your option) any later version. See the COPYING file in the top-level
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* directory.
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*/
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#ifndef S390_CCW_H
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#define S390_CCW_H
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/* #define DEBUG */
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typedef unsigned char u8;
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typedef unsigned short u16;
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typedef unsigned int u32;
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typedef unsigned long long u64;
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typedef unsigned long ulong;
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typedef unsigned char __u8;
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typedef unsigned short __u16;
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typedef unsigned int __u32;
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typedef unsigned long long __u64;
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#define true 1
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#define false 0
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#define PAGE_SIZE 4096
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#define EIO 1
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#define EBUSY 2
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#define ENODEV 3
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#ifndef NULL
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#define NULL 0
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#endif
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#ifndef MIN
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#define MIN(a, b) (((a) < (b)) ? (a) : (b))
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#endif
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#ifndef MIN_NON_ZERO
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#define MIN_NON_ZERO(a, b) ((a) == 0 ? (b) : \
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((b) == 0 ? (a) : (MIN(a, b))))
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#endif
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#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
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#include "cio.h"
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#include "iplb.h"
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/* start.s */
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void disabled_wait(void) __attribute__ ((__noreturn__));
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void consume_sclp_int(void);
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void consume_io_int(void);
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/* main.c */
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void write_subsystem_identification(void);
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void write_iplb_location(void);
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extern char stack[PAGE_SIZE * 8] __attribute__((__aligned__(PAGE_SIZE)));
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unsigned int get_loadparm_index(void);
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/* sclp.c */
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void sclp_print(const char *string);
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void sclp_set_write_mask(uint32_t receive_mask, uint32_t send_mask);
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void sclp_setup(void);
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void sclp_get_loadparm_ascii(char *loadparm);
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int sclp_read(char *str, size_t count);
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/* virtio.c */
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unsigned long virtio_load_direct(ulong rec_list1, ulong rec_list2,
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ulong subchan_id, void *load_addr);
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bool virtio_is_supported(SubChannelId schid);
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int virtio_blk_setup_device(SubChannelId schid);
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int virtio_read(ulong sector, void *load_addr);
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/* bootmap.c */
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void zipl_load(void);
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/* jump2ipl.c */
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void write_reset_psw(uint64_t psw);
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void jump_to_IPL_code(uint64_t address);
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void jump_to_low_kernel(void);
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/* menu.c */
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void menu_set_parms(uint8_t boot_menu_flag, uint32_t boot_menu_timeout);
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int menu_get_zipl_boot_index(const char *menu_data);
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bool menu_is_enabled_zipl(void);
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int menu_get_enum_boot_index(bool *valid_entries);
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bool menu_is_enabled_enum(void);
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#define MAX_BOOT_ENTRIES 31
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__attribute__ ((__noreturn__))
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static inline void panic(const char *string)
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{
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sclp_print(string);
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disabled_wait();
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}
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static inline void fill_hex(char *out, unsigned char val)
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{
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const char hex[] = "0123456789abcdef";
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out[0] = hex[(val >> 4) & 0xf];
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out[1] = hex[val & 0xf];
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}
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static inline void fill_hex_val(char *out, void *ptr, unsigned size)
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{
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unsigned char *value = ptr;
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unsigned int i;
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for (i = 0; i < size; i++) {
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fill_hex(&out[i*2], value[i]);
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}
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}
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static inline void print_int(const char *desc, u64 addr)
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{
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char out[] = ": 0xffffffffffffffff\n";
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fill_hex_val(&out[4], &addr, sizeof(addr));
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sclp_print(desc);
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sclp_print(out);
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}
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static inline void debug_print_int(const char *desc, u64 addr)
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{
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#ifdef DEBUG
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print_int(desc, addr);
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#endif
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}
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static inline void debug_print_addr(const char *desc, void *p)
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{
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#ifdef DEBUG
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debug_print_int(desc, (unsigned int)(unsigned long)p);
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#endif
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}
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/***********************************************
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* Hypercall functions *
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***********************************************/
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#define KVM_S390_VIRTIO_NOTIFY 0
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#define KVM_S390_VIRTIO_RESET 1
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#define KVM_S390_VIRTIO_SET_STATUS 2
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#define KVM_S390_VIRTIO_CCW_NOTIFY 3
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#define MAX_SECTOR_SIZE 4096
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static inline void IPL_assert(bool term, const char *message)
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{
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if (!term) {
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sclp_print("\n! ");
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sclp_print(message);
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panic(" !\n"); /* no return */
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}
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}
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static inline void IPL_check(bool term, const char *message)
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{
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if (!term) {
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sclp_print("\n! WARNING: ");
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sclp_print(message);
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sclp_print(" !\n");
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}
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}
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extern const unsigned char ebc2asc[256];
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static inline void ebcdic_to_ascii(const char *src,
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char *dst,
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unsigned int size)
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{
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unsigned int i;
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for (i = 0; i < size; i++) {
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unsigned c = src[i];
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dst[i] = ebc2asc[c];
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}
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}
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#endif /* S390_CCW_H */
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