FEX-Emu/linux
1
0
Fork 0
mirror of https://github.com/FEX-Emu/linux.git synced 2024-12-17 14:30:00 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity
72414d3f1d
linux/arch/ppc64/kernel/mpic.h
R Sharada fce0d57403 [PATCH] ppc64: kexec support for ppc64 
This patch implements the kexec support for ppc64 platforms.

A couple of notes:

1)  We copy the pages in virtual mode, using the full base kernel
    and a statically allocated stack.   At kexec_prepare time we
    scan the pages and if any overlap our (0, _end[]) range we
    return -ETXTBSY.

    On PowerPC 64 systems running in LPAR (logical partitioning)
    mode, only a small region of memory, referred to as the RMO,
    can be accessed in real mode.  Since Linux runs with only one
    zone of memory in the memory allocator, and it can be orders of
    magnitude more memory than the RMO, looping until we allocate
    pages in the source region is not feasible.  Copying in virtual
    means we don't have to write a hash table generation and call
    hypervisor to insert translations, instead we rely on the pinned
    kernel linear mapping.  The kernel already has move to linked
    location built in, so there is no requirement to load it at 0.

    If we want to load something other than a kernel, then a stub
    can be written to copy a linear chunk in real mode.

2)  The start entry point gets passed parameters from the kernel.
    Slaves are started at a fixed address after copying code from
    the entry point.

    All CPUs get passed their firmware assigned physical id in r3
    (most calling conventions use this register for the first
    argument).

    This is used to distinguish each CPU from all other CPUs.
    Since firmware is not around, there is no other way to obtain
    this information other than to pass it somewhere.

    A single CPU, referred to here as the master and the one executing
    the kexec call, branches to start with the address of start in r4.
    While this can be calculated, we have to load it through a gpr to
    branch to this point so defining the register this is contained
    in is free.  A stack of unspecified size is available at r1
    (also common calling convention).

    All remaining running CPUs are sent to start at absolute address
    0x60 after copying the first 0x100 bytes from start to address 0.
    This convention was chosen because it matches what the kernel
    has been doing itself.  (only gpr3 is defined).

    Note: This is not quite the convention of the kexec bootblock v2
    in the kernel.  A stub has been written to convert between them,
    and we may adjust the kernel in the future to allow this directly
    without any stub.

3)  Destination pages can be placed anywhere, even where they
    would not be accessible in real mode.  This will allow us to
    place ram disks above the RMO if we choose.

Signed-off-by: Milton Miller <miltonm@bga.com>
Signed-off-by: R Sharada <sharada@in.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-25 16:24:51 -07:00

274 lines
8.2 KiB
C
Raw Blame History

#include <linux/irq.h>
/*
* Global registers
*/
#define MPIC_GREG_BASE 0x01000
#define MPIC_GREG_FEATURE_0 0x00000
#define MPIC_GREG_FEATURE_LAST_SRC_MASK 0x07ff0000
#define MPIC_GREG_FEATURE_LAST_SRC_SHIFT 16
#define MPIC_GREG_FEATURE_LAST_CPU_MASK 0x00001f00
#define MPIC_GREG_FEATURE_LAST_CPU_SHIFT 8
#define MPIC_GREG_FEATURE_VERSION_MASK 0xff
#define MPIC_GREG_FEATURE_1 0x00010
#define MPIC_GREG_GLOBAL_CONF_0 0x00020
#define MPIC_GREG_GCONF_RESET 0x80000000
#define MPIC_GREG_GCONF_8259_PTHROU_DIS 0x20000000
#define MPIC_GREG_GCONF_BASE_MASK 0x000fffff
#define MPIC_GREG_GLOBAL_CONF_1 0x00030
#define MPIC_GREG_VENDOR_0 0x00040
#define MPIC_GREG_VENDOR_1 0x00050
#define MPIC_GREG_VENDOR_2 0x00060
#define MPIC_GREG_VENDOR_3 0x00070
#define MPIC_GREG_VENDOR_ID 0x00080
#define MPIC_GREG_VENDOR_ID_STEPPING_MASK 0x00ff0000
#define MPIC_GREG_VENDOR_ID_STEPPING_SHIFT 16
#define MPIC_GREG_VENDOR_ID_DEVICE_ID_MASK 0x0000ff00
#define MPIC_GREG_VENDOR_ID_DEVICE_ID_SHIFT 8
#define MPIC_GREG_VENDOR_ID_VENDOR_ID_MASK 0x000000ff
#define MPIC_GREG_PROCESSOR_INIT 0x00090
#define MPIC_GREG_IPI_VECTOR_PRI_0 0x000a0
#define MPIC_GREG_IPI_VECTOR_PRI_1 0x000b0
#define MPIC_GREG_IPI_VECTOR_PRI_2 0x000c0
#define MPIC_GREG_IPI_VECTOR_PRI_3 0x000d0
#define MPIC_GREG_SPURIOUS 0x000e0
#define MPIC_GREG_TIMER_FREQ 0x000f0
/*
*
* Timer registers
*/
#define MPIC_TIMER_BASE 0x01100
#define MPIC_TIMER_STRIDE 0x40
#define MPIC_TIMER_CURRENT_CNT 0x00000
#define MPIC_TIMER_BASE_CNT 0x00010
#define MPIC_TIMER_VECTOR_PRI 0x00020
#define MPIC_TIMER_DESTINATION 0x00030
/*
* Per-Processor registers
*/
#define MPIC_CPU_THISBASE 0x00000
#define MPIC_CPU_BASE 0x20000
#define MPIC_CPU_STRIDE 0x01000
#define MPIC_CPU_IPI_DISPATCH_0 0x00040
#define MPIC_CPU_IPI_DISPATCH_1 0x00050
#define MPIC_CPU_IPI_DISPATCH_2 0x00060
#define MPIC_CPU_IPI_DISPATCH_3 0x00070
#define MPIC_CPU_CURRENT_TASK_PRI 0x00080
#define MPIC_CPU_TASKPRI_MASK 0x0000000f
#define MPIC_CPU_WHOAMI 0x00090
#define MPIC_CPU_WHOAMI_MASK 0x0000001f
#define MPIC_CPU_INTACK 0x000a0
#define MPIC_CPU_EOI 0x000b0
/*
* Per-source registers
*/
#define MPIC_IRQ_BASE 0x10000
#define MPIC_IRQ_STRIDE 0x00020
#define MPIC_IRQ_VECTOR_PRI 0x00000
#define MPIC_VECPRI_MASK 0x80000000
#define MPIC_VECPRI_ACTIVITY 0x40000000 /* Read Only */
#define MPIC_VECPRI_PRIORITY_MASK 0x000f0000
#define MPIC_VECPRI_PRIORITY_SHIFT 16
#define MPIC_VECPRI_VECTOR_MASK 0x000007ff
#define MPIC_VECPRI_POLARITY_POSITIVE 0x00800000
#define MPIC_VECPRI_POLARITY_NEGATIVE 0x00000000
#define MPIC_VECPRI_POLARITY_MASK 0x00800000
#define MPIC_VECPRI_SENSE_LEVEL 0x00400000
#define MPIC_VECPRI_SENSE_EDGE 0x00000000
#define MPIC_VECPRI_SENSE_MASK 0x00400000
#define MPIC_IRQ_DESTINATION 0x00010
#define MPIC_MAX_IRQ_SOURCES 2048
#define MPIC_MAX_CPUS 32
#define MPIC_MAX_ISU 32
/*
* Special vector numbers (internal use only)
*/
#define MPIC_VEC_SPURRIOUS 255
#define MPIC_VEC_IPI_3 254
#define MPIC_VEC_IPI_2 253
#define MPIC_VEC_IPI_1 252
#define MPIC_VEC_IPI_0 251
/* unused */
#define MPIC_VEC_TIMER_3 250
#define MPIC_VEC_TIMER_2 249
#define MPIC_VEC_TIMER_1 248
#define MPIC_VEC_TIMER_0 247
/* Type definition of the cascade handler */
typedef int (*mpic_cascade_t)(struct pt_regs *regs, void *data);
#ifdef CONFIG_MPIC_BROKEN_U3
/* Fixup table entry */
struct mpic_irq_fixup
{
u8 __iomem *base;
unsigned int irq;
};
#endif /* CONFIG_MPIC_BROKEN_U3 */
/* The instance data of a given MPIC */
struct mpic
{
/* The "linux" controller struct */
hw_irq_controller hc_irq;
#ifdef CONFIG_SMP
hw_irq_controller hc_ipi;
#endif
const char *name;
/* Flags */
unsigned int flags;
/* How many irq sources in a given ISU */
unsigned int isu_size;
unsigned int isu_shift;
unsigned int isu_mask;
/* Offset of irq vector numbers */
unsigned int irq_offset;
unsigned int irq_count;
/* Offset of ipi vector numbers */
unsigned int ipi_offset;
/* Number of sources */
unsigned int num_sources;
/* Number of CPUs */
unsigned int num_cpus;
/* cascade handler */
mpic_cascade_t cascade;
void *cascade_data;
unsigned int cascade_vec;
/* senses array */
unsigned char *senses;
unsigned int senses_count;
#ifdef CONFIG_MPIC_BROKEN_U3
/* The fixup table */
struct mpic_irq_fixup *fixups;
spinlock_t fixup_lock;
#endif
/* The various ioremap'ed bases */
volatile u32 __iomem *gregs;
volatile u32 __iomem *tmregs;
volatile u32 __iomem *cpuregs[MPIC_MAX_CPUS];
volatile u32 __iomem *isus[MPIC_MAX_ISU];
/* link */
struct mpic *next;
};
/* This is the primary controller, only that one has IPIs and
* has afinity control. A non-primary MPIC always uses CPU0
* registers only
*/
#define MPIC_PRIMARY 0x00000001
/* Set this for a big-endian MPIC */
#define MPIC_BIG_ENDIAN 0x00000002
/* Broken U3 MPIC */
#define MPIC_BROKEN_U3 0x00000004
/* Broken IPI registers (autodetected) */
#define MPIC_BROKEN_IPI 0x00000008
/* MPIC wants a reset */
#define MPIC_WANTS_RESET 0x00000010
/* Allocate the controller structure and setup the linux irq descs
* for the range if interrupts passed in. No HW initialization is
* actually performed.
*
* @phys_addr: physial base address of the MPIC
* @flags: flags, see constants above
* @isu_size: number of interrupts in an ISU. Use 0 to use a
* standard ISU-less setup (aka powermac)
* @irq_offset: first irq number to assign to this mpic
* @irq_count: number of irqs to use with this mpic IRQ sources. Pass 0
* to match the number of sources
* @ipi_offset: first irq number to assign to this mpic IPI sources,
* used only on primary mpic
* @senses: array of sense values
* @senses_num: number of entries in the array
*
* Note about the sense array. If none is passed, all interrupts are
* setup to be level negative unless MPIC_BROKEN_U3 is set in which
* case they are edge positive (and the array is ignored anyway).
* The values in the array start at the first source of the MPIC,
* that is senses[0] correspond to linux irq "irq_offset".
*/
extern struct mpic *mpic_alloc(unsigned long phys_addr,
unsigned int flags,
unsigned int isu_size,
unsigned int irq_offset,
unsigned int irq_count,
unsigned int ipi_offset,
unsigned char *senses,
unsigned int senses_num,
const char *name);
/* Assign ISUs, to call before mpic_init()
*
* @mpic: controller structure as returned by mpic_alloc()
* @isu_num: ISU number
* @phys_addr: physical address of the ISU
*/
extern void mpic_assign_isu(struct mpic *mpic, unsigned int isu_num,
unsigned long phys_addr);
/* Initialize the controller. After this has been called, none of the above
* should be called again for this mpic
*/
extern void mpic_init(struct mpic *mpic);
/* Setup a cascade. Currently, only one cascade is supported this
* way, though you can always do a normal request_irq() and add
* other cascades this way. You should call this _after_ having
* added all the ISUs
*
* @irq_no: "linux" irq number of the cascade (that is offset'ed vector)
* @handler: cascade handler function
*/
extern void mpic_setup_cascade(unsigned int irq_no, mpic_cascade_t hanlder,
void *data);
/*
* All of the following functions must only be used after the
* ISUs have been assigned and the controller fully initialized
* with mpic_init()
*/
/* Change/Read the priority of an interrupt. Default is 8 for irqs and
* 10 for IPIs. You can call this on both IPIs and IRQ numbers, but the
* IPI number is then the offset'ed (linux irq number mapped to the IPI)
*/
extern void mpic_irq_set_priority(unsigned int irq, unsigned int pri);
extern unsigned int mpic_irq_get_priority(unsigned int irq);
/* Setup a non-boot CPU */
extern void mpic_setup_this_cpu(void);
/* Clean up for kexec (or cpu offline or ...) */
extern void mpic_teardown_this_cpu(void);
/* Request IPIs on primary mpic */
extern void mpic_request_ipis(void);
/* Send an IPI (non offseted number 0..3) */
extern void mpic_send_ipi(unsigned int ipi_no, unsigned int cpu_mask);
/* Fetch interrupt from a given mpic */
extern int mpic_get_one_irq(struct mpic *mpic, struct pt_regs *regs);
/* This one gets to the primary mpic */
extern int mpic_get_irq(struct pt_regs *regs);
/* global mpic for pSeries */
extern struct mpic *pSeries_mpic;
Reference in New Issue View Git Blame Copy Permalink