diff options
Diffstat (limited to 'arch/sh/include/asm/kexec.h')
| -rw-r--r-- | arch/sh/include/asm/kexec.h | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/arch/sh/include/asm/kexec.h b/arch/sh/include/asm/kexec.h new file mode 100644 index 0000000000..927d80ba23 --- /dev/null +++ b/arch/sh/include/asm/kexec.h @@ -0,0 +1,72 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ASM_SH_KEXEC_H +#define __ASM_SH_KEXEC_H + +#include <asm/ptrace.h> +#include <asm/string.h> +#include <linux/kernel.h> + +/* + * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return. + * I.e. Maximum page that is mapped directly into kernel memory, + * and kmap is not required. + * + * Someone correct me if FIXADDR_START - PAGEOFFSET is not the correct + * calculation for the amount of memory directly mappable into the + * kernel memory space. + */ + +/* Maximum physical address we can use pages from */ +#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL) +/* Maximum address we can reach in physical address mode */ +#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL) +/* Maximum address we can use for the control code buffer */ +#define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE + +#define KEXEC_CONTROL_PAGE_SIZE 4096 + +/* The native architecture */ +#define KEXEC_ARCH KEXEC_ARCH_SH + +#ifdef CONFIG_KEXEC +/* arch/sh/kernel/machine_kexec.c */ +void reserve_crashkernel(void); + +static inline void crash_setup_regs(struct pt_regs *newregs, + struct pt_regs *oldregs) +{ + if (oldregs) + memcpy(newregs, oldregs, sizeof(*newregs)); + else { + __asm__ __volatile__ ("mov r0, %0" : "=r" (newregs->regs[0])); + __asm__ __volatile__ ("mov r1, %0" : "=r" (newregs->regs[1])); + __asm__ __volatile__ ("mov r2, %0" : "=r" (newregs->regs[2])); + __asm__ __volatile__ ("mov r3, %0" : "=r" (newregs->regs[3])); + __asm__ __volatile__ ("mov r4, %0" : "=r" (newregs->regs[4])); + __asm__ __volatile__ ("mov r5, %0" : "=r" (newregs->regs[5])); + __asm__ __volatile__ ("mov r6, %0" : "=r" (newregs->regs[6])); + __asm__ __volatile__ ("mov r7, %0" : "=r" (newregs->regs[7])); + __asm__ __volatile__ ("mov r8, %0" : "=r" (newregs->regs[8])); + __asm__ __volatile__ ("mov r9, %0" : "=r" (newregs->regs[9])); + __asm__ __volatile__ ("mov r10, %0" : "=r" (newregs->regs[10])); + __asm__ __volatile__ ("mov r11, %0" : "=r" (newregs->regs[11])); + __asm__ __volatile__ ("mov r12, %0" : "=r" (newregs->regs[12])); + __asm__ __volatile__ ("mov r13, %0" : "=r" (newregs->regs[13])); + __asm__ __volatile__ ("mov r14, %0" : "=r" (newregs->regs[14])); + __asm__ __volatile__ ("mov r15, %0" : "=r" (newregs->regs[15])); + + __asm__ __volatile__ ("sts pr, %0" : "=r" (newregs->pr)); + __asm__ __volatile__ ("sts macl, %0" : "=r" (newregs->macl)); + __asm__ __volatile__ ("sts mach, %0" : "=r" (newregs->mach)); + + __asm__ __volatile__ ("stc gbr, %0" : "=r" (newregs->gbr)); + __asm__ __volatile__ ("stc sr, %0" : "=r" (newregs->sr)); + + newregs->pc = _THIS_IP_; + } +} +#else +static inline void reserve_crashkernel(void) { } +#endif /* CONFIG_KEXEC */ + +#endif /* __ASM_SH_KEXEC_H */ |