diff options
| -rw-r--r-- | pc-bios/s390-ccw/Makefile | 11 | ||||
| -rw-r--r-- | pc-bios/s390-ccw/netboot.mak | 47 | ||||
| -rw-r--r-- | pc-bios/s390-ccw/netmain.c | 136 |
3 files changed, 192 insertions, 2 deletions
diff --git a/pc-bios/s390-ccw/Makefile b/pc-bios/s390-ccw/Makefile index 82b41ef671..cbae74522a 100644 --- a/pc-bios/s390-ccw/Makefile +++ b/pc-bios/s390-ccw/Makefile @@ -16,7 +16,7 @@ QEMU_CFLAGS += -march=z900 -fPIE -fno-strict-aliasing QEMU_CFLAGS += $(call cc-option, $(QEMU_CFLAGS), -fno-stack-protector) LDFLAGS += -Wl,-pie -nostdlib -build-all: s390-ccw.img +build-all: s390-ccw.img s390-netboot.img s390-ccw.elf: $(OBJECTS) $(call quiet-command,$(CC) $(LDFLAGS) -o $@ $(OBJECTS),"BUILD","$(TARGET_DIR)$@") @@ -28,5 +28,12 @@ s390-ccw.img: s390-ccw.elf $(OBJECTS): Makefile +ifneq ($(wildcard $(SRC_PATH)/roms/SLOF/lib/libnet),) +include $(SRC_PATH)/pc-bios/s390-ccw/netboot.mak +else +s390-netboot.img: + @echo "s390-netboot.img not built since roms/SLOF/ is not available." +endif + clean: - rm -f *.o *.d *.img *.elf *~ + $(RM) *.o *.d *.img *.elf *~ *.a diff --git a/pc-bios/s390-ccw/netboot.mak b/pc-bios/s390-ccw/netboot.mak new file mode 100644 index 0000000000..44b7645a8f --- /dev/null +++ b/pc-bios/s390-ccw/netboot.mak @@ -0,0 +1,47 @@ + +SLOF_DIR := $(SRC_PATH)/roms/SLOF + +NETOBJS := start.o sclp.o virtio.o netmain.o libc.a + +LIBC_INC := -nostdinc -I$(SLOF_DIR)/lib/libc/include +LIBNET_INC := -I$(SLOF_DIR)/lib/libnet + +NETLDFLAGS := $(LDFLAGS) -Ttext=0x7800000 + +$(NETOBJS): QEMU_CFLAGS += $(LIBC_INC) $(LIBNET_INC) + +s390-netboot.elf: $(NETOBJS) + $(call quiet-command,$(CC) $(NETLDFLAGS) -o $@ $(NETOBJS),"BUILD","$(TARGET_DIR)$@") + +s390-netboot.img: s390-netboot.elf + $(call quiet-command,$(STRIP) --strip-unneeded $< -o $@,"STRIP","$(TARGET_DIR)$@") + +# libc files: + +LIBC_CFLAGS := $(QEMU_CFLAGS) $(LIBC_INC) $(LIBNET_INC) + +CTYPE_OBJS = isdigit.o isxdigit.o toupper.o +%.o : $(SLOF_DIR)/lib/libc/ctype/%.c + $(call quiet-command,$(CC) $(LIBC_CFLAGS) -c -o $@ $<,"CC","$(TARGET_DIR)$@") + +STRING_OBJS = strcat.o strchr.o strcmp.o strcpy.o strlen.o strncmp.o strncpy.o \ + strstr.o memset.o memcpy.o memmove.o memcmp.o +%.o : $(SLOF_DIR)/lib/libc/string/%.c + $(call quiet-command,$(CC) $(LIBC_CFLAGS) -c -o $@ $<,"CC","$(TARGET_DIR)$@") + +STDLIB_OBJS = atoi.o atol.o strtoul.o strtol.o rand.o malloc.o free.o +%.o : $(SLOF_DIR)/lib/libc/stdlib/%.c + $(call quiet-command,$(CC) $(LIBC_CFLAGS) -c -o $@ $<,"CC","$(TARGET_DIR)$@") + +STDIO_OBJS = sprintf.o vfprintf.o vsnprintf.o vsprintf.o fprintf.o \ + printf.o putc.o puts.o putchar.o stdchnls.o fileno.o +%.o : $(SLOF_DIR)/lib/libc/stdio/%.c + $(call quiet-command,$(CC) $(LIBC_CFLAGS) -c -o $@ $<,"CC","$(TARGET_DIR)$@") + +sbrk.o: $(SLOF_DIR)/slof/sbrk.c + $(call quiet-command,$(CC) $(LIBC_CFLAGS) -c -o $@ $<,"CC","$(TARGET_DIR)$@") + +LIBCOBJS := $(STRING_OBJS) $(CTYPE_OBJS) $(STDLIB_OBJS) $(STDIO_OBJS) sbrk.o + +libc.a: $(LIBCOBJS) + $(call quiet-command,$(AR) -rc $@ $^,"AR","$(TARGET_DIR)$@") diff --git a/pc-bios/s390-ccw/netmain.c b/pc-bios/s390-ccw/netmain.c new file mode 100644 index 0000000000..a69b3dd181 --- /dev/null +++ b/pc-bios/s390-ccw/netmain.c @@ -0,0 +1,136 @@ +/* + * S390 virtio-ccw network boot loading program + * + * Copyright 2017 Thomas Huth, Red Hat Inc. + * + * Based on the S390 virtio-ccw loading program (main.c) + * Copyright (c) 2013 Alexander Graf <agraf@suse.de> + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + */ + +#include <stdint.h> +#include <stdbool.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <time.h> + +#include "s390-ccw.h" +#include "virtio.h" + +extern char _start[]; + +char stack[PAGE_SIZE * 8] __attribute__((aligned(PAGE_SIZE))); +IplParameterBlock iplb __attribute__((aligned(PAGE_SIZE))); + +static SubChannelId net_schid = { .one = 1 }; +static uint64_t dest_timer; + +static uint64_t get_timer_ms(void) +{ + uint64_t clk; + + asm volatile(" stck %0 " : : "Q"(clk) : "memory"); + + /* Bit 51 is incremented each microsecond */ + return (clk >> (63 - 51)) / 1000; +} + +void set_timer(int val) +{ + dest_timer = get_timer_ms() + val; +} + +int get_timer(void) +{ + return dest_timer - get_timer_ms(); +} + +int get_sec_ticks(void) +{ + return 1000; /* number of ticks in 1 second */ +} + +void panic(const char *string) +{ + sclp_print(string); + for (;;) { + disabled_wait(); + } +} + +static bool find_net_dev(Schib *schib, int dev_no) +{ + int i, r; + + for (i = 0; i < 0x10000; i++) { + net_schid.sch_no = i; + r = stsch_err(net_schid, schib); + if (r == 3 || r == -EIO) { + break; + } + if (!schib->pmcw.dnv) { + continue; + } + if (!virtio_is_supported(net_schid)) { + continue; + } + if (virtio_get_device_type() != VIRTIO_ID_NET) { + continue; + } + if (dev_no < 0 || schib->pmcw.dev == dev_no) { + return true; + } + } + + return false; +} + +static void virtio_setup(void) +{ + Schib schib; + int ssid; + bool found = false; + uint16_t dev_no; + + /* + * We unconditionally enable mss support. In every sane configuration, + * this will succeed; and even if it doesn't, stsch_err() can deal + * with the consequences. + */ + enable_mss_facility(); + + if (store_iplb(&iplb)) { + IPL_assert(iplb.pbt == S390_IPL_TYPE_CCW, "IPL_TYPE_CCW expected"); + dev_no = iplb.ccw.devno; + debug_print_int("device no. ", dev_no); + net_schid.ssid = iplb.ccw.ssid & 0x3; + debug_print_int("ssid ", net_schid.ssid); + found = find_net_dev(&schib, dev_no); + } else { + for (ssid = 0; ssid < 0x3; ssid++) { + net_schid.ssid = ssid; + found = find_net_dev(&schib, -1); + if (found) { + break; + } + } + } + + IPL_assert(found, "No virtio net device found"); +} + +void main(void) +{ + sclp_setup(); + sclp_print("Network boot starting...\n"); + + virtio_setup(); + + panic("Failed to load OS from network\n"); +} |