Commit b3df895a authored by Sebastian Andrzej Siewior's avatar Sebastian Andrzej Siewior Committed by Kumar Gala
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powerpc/kexec: Add support for FSL-BookE 



This adds support kexec on FSL-BookE where the MMU can not be simply
switched off. The code borrows the initial MMU-setup code to create the
identical mapping mapping. The only difference to the original boot code
is the size of the mapping(s) and the executeable address.
The kexec code maps the first 2 GiB of memory in 256 MiB steps. This
should work also on e500v1 boxes.
SMP support is still not available.

(Kumar: Added minor change to build to ifdef CONFIG_PPC_STD_MMU_64 some
code that was PPC64 specific)

Signed-off-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: default avatarKumar Gala <galak@kernel.crashing.org>
parent 7c08ce71

arch/powerpc/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -351,7 +351,7 @@ config ARCH_ENABLE_MEMORY_HOTREMOVE 


config KEXEC

	bool "kexec system call (EXPERIMENTAL)"

	depends on PPC_BOOK3S && EXPERIMENTAL

	depends on (PPC_BOOK3S || (FSL_BOOKE && !SMP)) && EXPERIMENTAL

	help

	  kexec is a system call that implements the ability to shutdown your

	  current kernel, and to start another kernel.  It is like a reboot

arch/powerpc/include/asm/kexec.h

+13 −0
Original line number Diff line number Diff line
@@ -2,6 +2,18 @@ 
#define _ASM_POWERPC_KEXEC_H

#ifdef __KERNEL__



#ifdef CONFIG_FSL_BOOKE



/*

 * On FSL-BookE we setup a 1:1 mapping which covers the first 2GiB of memory

 * and therefore we can only deal with memory within this range

 */

#define KEXEC_SOURCE_MEMORY_LIMIT	(2 * 1024 * 1024 * 1024UL)

#define KEXEC_DESTINATION_MEMORY_LIMIT	(2 * 1024 * 1024 * 1024UL)

#define KEXEC_CONTROL_MEMORY_LIMIT	(2 * 1024 * 1024 * 1024UL)



#else



/*

 * Maximum page that is mapped directly into kernel memory.

 * XXX: Since we copy virt we can use any page we allocate
@@ -21,6 +33,7 @@ 
/* TASK_SIZE, probably left over from use_mm ?? */

#define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE

#endif

#endif



#define KEXEC_CONTROL_PAGE_SIZE 4096

arch/powerpc/kernel/crash.c

+4 −0
Original line number Diff line number Diff line
@@ -163,6 +163,7 @@ static void crash_kexec_prepare_cpus(int cpu) 
}



/* wait for all the CPUs to hit real mode but timeout if they don't come in */

#ifdef CONFIG_PPC_STD_MMU_64

static void crash_kexec_wait_realmode(int cpu)

{

	unsigned int msecs;
@@ -187,6 +188,7 @@ static void crash_kexec_wait_realmode(int cpu) 
	}

	mb();

}

#endif



/*

 * This function will be called by secondary cpus or by kexec cpu
@@ -445,7 +447,9 @@ void default_machine_crash_shutdown(struct pt_regs *regs) 
	crash_kexec_prepare_cpus(crashing_cpu);

	cpu_set(crashing_cpu, cpus_in_crash);

	crash_kexec_stop_spus();

#ifdef CONFIG_PPC_STD_MMU_64

	crash_kexec_wait_realmode(crashing_cpu);

#endif

	if (ppc_md.kexec_cpu_down)

		ppc_md.kexec_cpu_down(1, 0);

}

arch/powerpc/kernel/fsl_booke_entry_mapping.S

+37 −0
Original line number Diff line number Diff line
@@ -159,6 +159,8 @@ skpinv: addi r6,r6,1 /* Increment */ 
#define M_IF_SMP	0

#endif



#if defined(ENTRY_MAPPING_BOOT_SETUP)



/* 6. Setup KERNELBASE mapping in TLB1[0] */

	lis	r6,0x1000		/* Set MAS0(TLBSEL) = TLB1(1), ESEL = 0 */

	mtspr	SPRN_MAS0,r6
@@ -174,6 +176,41 @@ skpinv: addi r6,r6,1 /* Increment */ 
/* 7. Jump to KERNELBASE mapping */

	lis	r6,(KERNELBASE & ~0xfff)@h

	ori	r6,r6,(KERNELBASE & ~0xfff)@l



#elif defined(ENTRY_MAPPING_KEXEC_SETUP)

/*

 * 6. Setup a 1:1 mapping in TLB1. Esel 0 is unsued, 1 or 2 contains the tmp

 * mapping so we start at 3. We setup 8 mappings, each 256MiB in size. This

 * will cover the first 2GiB of memory.

 */



	lis r10, (MAS1_VALID|MAS1_IPROT)@h

	ori r10,r10, (MAS1_TSIZE(BOOK3E_PAGESZ_256M))@l

	li  r11, 0

	li  r0, 8

	mtctr   r0



next_tlb_setup:

	addi	r0, r11, 3

	rlwinm  r0, r0, 16, 4, 15  // Compute esel

	rlwinm  r9, r11, 28, 0, 3   // Compute [ER]PN

	oris    r0, r0, (MAS0_TLBSEL(1))@h

	mtspr   SPRN_MAS0,r0

	mtspr   SPRN_MAS1,r10

	mtspr   SPRN_MAS2,r9

	ori r9, r9, (MAS3_SX|MAS3_SW|MAS3_SR)

	mtspr   SPRN_MAS3,r9

	tlbwe

	addi    r11, r11, 1

	bdnz+   next_tlb_setup



/* 7. Jump to our 1:1 mapping */

	li	r6, 0



#else

	#error You need to specify the mapping or not use this at all.

#endif



	lis	r7,MSR_KERNEL@h

	ori	r7,r7,MSR_KERNEL@l

	bl	1f			/* Find our address */

arch/powerpc/kernel/head_fsl_booke.S

+2 −0
Original line number Diff line number Diff line
@@ -95,7 +95,9 @@ _ENTRY(_start); 


_ENTRY(__early_start)



#define ENTRY_MAPPING_BOOT_SETUP

#include "fsl_booke_entry_mapping.S"

#undef ENTRY_MAPPING_BOOT_SETUP



	/* Establish the interrupt vector offsets */

	SET_IVOR(0,  CriticalInput);

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