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https://github.com/ibm-s390-linux/s390-tools.git
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041e6131d1
Add a check to the stage3b that the kernel cmdline is always null-terminated. While at it, ensure the coding style is consistent. Reviewed-by: Steffen Eiden <seiden@linux.ibm.com> Signed-off-by: Marc Hartmayer <mhartmay@linux.ibm.com> Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>
93 lines
2.3 KiB
C
93 lines
2.3 KiB
C
/*
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* Main program for stage3b bootloader
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*
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* Copyright IBM Corp. 2020
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*
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* s390-tools is free software; you can redistribute it and/or modify
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* it under the terms of the MIT license. See LICENSE for details.
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*/
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#include "libc.h"
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#include "stage3b.h"
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#include "lib/zt_common.h"
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#include "boot/psw.h"
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#include "boot/error.h"
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#include "boot/s390.h"
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#include "boot/linux_layout.h"
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#include "boot/loaders_layout.h"
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#include "sclp.h"
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static volatile struct stage3b_args __section(".loader_parms") loader_parms;
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static inline void __noreturn load_psw(struct psw_t psw)
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{
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asm volatile("lpswe %0" : : "Q"(psw) : "cc");
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while (1)
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;
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}
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static unsigned long get_kernel_cmdline_size(void)
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{
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unsigned long size = *(volatile unsigned long *)MAX_COMMAND_LINE_SIZE;
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if (size != 0)
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return size;
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return LEGACY_COMMAND_LINE_SIZE;
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}
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void __noreturn start(void)
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{
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volatile struct stage3b_args *args = &loader_parms;
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volatile struct memblob *kernel = &args->kernel;
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volatile struct memblob *cmdline = &args->cmdline;
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volatile struct memblob *initrd = &args->initrd;
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struct psw_t psw = args->psw;
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/* set up ASCII and line-mode */
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sclp_setup(SCLP_LINE_ASCII_INIT);
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if (kernel->size < IMAGE_LOAD_ADDRESS)
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panic(EINTERNAL, "Invalid kernel\n");
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/* move the kernel and cut the kernel header */
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memmove((void *)IMAGE_LOAD_ADDRESS,
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(void *)(kernel->src + IMAGE_LOAD_ADDRESS),
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kernel->size - IMAGE_LOAD_ADDRESS);
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if (cmdline->size > get_kernel_cmdline_size())
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panic(EINTERNAL, "Command line is too large\n");
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if (cmdline->size > 0) {
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/* make sure the cmdline is a null-terminated string */
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if (((char *)cmdline->src)[cmdline->size - 1] != '\0')
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panic(EINTERNAL, "Command line needs to be null-terminated\n");
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/* move the kernel cmdline */
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memmove((void *)COMMAND_LINE, (void *)cmdline->src, cmdline->size);
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}
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/* the initrd does not need to be moved */
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if (initrd->size > 0) {
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/* copy initrd start address and size into new kernel space */
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*(unsigned long long *)INITRD_START = initrd->src;
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*(unsigned long long *)INITRD_SIZE = initrd->size;
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}
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/* disable ASCII and line-mode */
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sclp_setup(SCLP_DISABLE);
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/* use lpswe instead of diag308 as a I/O subsystem reset is not
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* needed as this was already done by the diag308 subcode 10 call
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* in stage3a
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*/
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load_psw(psw);
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}
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void panic_notify(unsigned long UNUSED(rc))
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{
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}
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