It is possible while waiting for multiple types of external interrupts that we might have pending irqs remaining between irq consumption and irq-type disabling. Those interrupts could potentially propagate to the guest after IPL completes and cause unwanted behavior. As it is today, the SCLP will only recognize write events that are enabled by the control program's send and receive masks. To limit the window for, and prevent further irqs from, ASCII console events (specifically keystrokes), we should only enable the control program's receive mask when we need it. While we're at it, remove assignment of the (non control program) send and receive masks, as those are actually set by the SCLP. Signed-off-by: Collin L. Walling <walling@linux.vnet.ibm.com> Reviewed-by: Thomas Huth <thuth@redhat.com> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Thomas Huth <thuth@redhat.com>
196 lines
4.4 KiB
C
196 lines
4.4 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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#ifndef EIO
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#define EIO 1
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#endif
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#ifndef EBUSY
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#define EBUSY 2
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#endif
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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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typedef struct irb Irb;
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typedef struct ccw1 Ccw1;
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typedef struct cmd_orb CmdOrb;
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typedef struct schib Schib;
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typedef struct chsc_area_sda ChscAreaSda;
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typedef struct senseid SenseId;
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typedef struct subchannel_id SubChannelId;
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/* start.s */
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void disabled_wait(void);
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void consume_sclp_int(void);
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/* main.c */
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void panic(const char *string);
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void write_subsystem_identification(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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void virtio_blk_setup_device(SubChannelId schid);
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int virtio_read(ulong sector, void *load_addr);
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int enable_mss_facility(void);
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u64 get_clock(void);
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ulong get_second(void);
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/* bootmap.c */
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void zipl_load(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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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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static inline void yield(void)
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{
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asm volatile ("diag 0,0,0x44"
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: :
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: "memory", "cc");
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}
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#define MAX_SECTOR_SIZE 4096
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static inline void sleep(unsigned int seconds)
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{
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ulong target = get_second() + seconds;
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while (get_second() < target) {
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yield();
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}
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}
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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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