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Diffstat (limited to 'arch/powerpc/include/asm/epapr_hcalls.h')
| -rw-r--r-- | arch/powerpc/include/asm/epapr_hcalls.h | 502 |
1 files changed, 502 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/epapr_hcalls.h b/arch/powerpc/include/asm/epapr_hcalls.h new file mode 100644 index 00000000000..f3b0c2cc9fe --- /dev/null +++ b/arch/powerpc/include/asm/epapr_hcalls.h @@ -0,0 +1,502 @@ +/* + * ePAPR hcall interface + * + * Copyright 2008-2011 Freescale Semiconductor, Inc. + * + * Author: Timur Tabi <timur@freescale.com> + * + * This file is provided under a dual BSD/GPL license. When using or + * redistributing this file, you may do so under either license. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * * Neither the name of Freescale Semiconductor nor the + * names of its contributors may be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * + * ALTERNATIVELY, this software may be distributed under the terms of the + * GNU General Public License ("GPL") as published by the Free Software + * Foundation, either version 2 of that License or (at your option) any + * later version. + * + * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY + * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +/* A "hypercall" is an "sc 1" instruction. This header file file provides C + * wrapper functions for the ePAPR hypervisor interface. It is inteded + * for use by Linux device drivers and other operating systems. + * + * The hypercalls are implemented as inline assembly, rather than assembly + * language functions in a .S file, for optimization. It allows + * the caller to issue the hypercall instruction directly, improving both + * performance and memory footprint. + */ + +#ifndef _EPAPR_HCALLS_H +#define _EPAPR_HCALLS_H + +#include <linux/types.h> +#include <linux/errno.h> +#include <asm/byteorder.h> + +#define EV_BYTE_CHANNEL_SEND 1 +#define EV_BYTE_CHANNEL_RECEIVE 2 +#define EV_BYTE_CHANNEL_POLL 3 +#define EV_INT_SET_CONFIG 4 +#define EV_INT_GET_CONFIG 5 +#define EV_INT_SET_MASK 6 +#define EV_INT_GET_MASK 7 +#define EV_INT_IACK 9 +#define EV_INT_EOI 10 +#define EV_INT_SEND_IPI 11 +#define EV_INT_SET_TASK_PRIORITY 12 +#define EV_INT_GET_TASK_PRIORITY 13 +#define EV_DOORBELL_SEND 14 +#define EV_MSGSND 15 +#define EV_IDLE 16 + +/* vendor ID: epapr */ +#define EV_LOCAL_VENDOR_ID 0 /* for private use */ +#define EV_EPAPR_VENDOR_ID 1 +#define EV_FSL_VENDOR_ID 2 /* Freescale Semiconductor */ +#define EV_IBM_VENDOR_ID 3 /* IBM */ +#define EV_GHS_VENDOR_ID 4 /* Green Hills Software */ +#define EV_ENEA_VENDOR_ID 5 /* Enea */ +#define EV_WR_VENDOR_ID 6 /* Wind River Systems */ +#define EV_AMCC_VENDOR_ID 7 /* Applied Micro Circuits */ +#define EV_KVM_VENDOR_ID 42 /* KVM */ + +/* The max number of bytes that a byte channel can send or receive per call */ +#define EV_BYTE_CHANNEL_MAX_BYTES 16 + + +#define _EV_HCALL_TOKEN(id, num) (((id) << 16) | (num)) +#define EV_HCALL_TOKEN(hcall_num) _EV_HCALL_TOKEN(EV_EPAPR_VENDOR_ID, hcall_num) + +/* epapr error codes */ +#define EV_EPERM 1 /* Operation not permitted */ +#define EV_ENOENT 2 /* Entry Not Found */ +#define EV_EIO 3 /* I/O error occured */ +#define EV_EAGAIN 4 /* The operation had insufficient + * resources to complete and should be + * retried + */ +#define EV_ENOMEM 5 /* There was insufficient memory to + * complete the operation */ +#define EV_EFAULT 6 /* Bad guest address */ +#define EV_ENODEV 7 /* No such device */ +#define EV_EINVAL 8 /* An argument supplied to the hcall + was out of range or invalid */ +#define EV_INTERNAL 9 /* An internal error occured */ +#define EV_CONFIG 10 /* A configuration error was detected */ +#define EV_INVALID_STATE 11 /* The object is in an invalid state */ +#define EV_UNIMPLEMENTED 12 /* Unimplemented hypercall */ +#define EV_BUFFER_OVERFLOW 13 /* Caller-supplied buffer too small */ + +/* + * Hypercall register clobber list + * + * These macros are used to define the list of clobbered registers during a + * hypercall. Technically, registers r0 and r3-r12 are always clobbered, + * but the gcc inline assembly syntax does not allow us to specify registers + * on the clobber list that are also on the input/output list. Therefore, + * the lists of clobbered registers depends on the number of register + * parmeters ("+r" and "=r") passed to the hypercall. + * + * Each assembly block should use one of the HCALL_CLOBBERSx macros. As a + * general rule, 'x' is the number of parameters passed to the assembly + * block *except* for r11. + * + * If you're not sure, just use the smallest value of 'x' that does not + * generate a compilation error. Because these are static inline functions, + * the compiler will only check the clobber list for a function if you + * compile code that calls that function. + * + * r3 and r11 are not included in any clobbers list because they are always + * listed as output registers. + * + * XER, CTR, and LR are currently listed as clobbers because it's uncertain + * whether they will be clobbered. + * + * Note that r11 can be used as an output parameter. +*/ + +/* List of common clobbered registers. Do not use this macro. */ +#define EV_HCALL_CLOBBERS "r0", "r12", "xer", "ctr", "lr", "cc" + +#define EV_HCALL_CLOBBERS8 EV_HCALL_CLOBBERS +#define EV_HCALL_CLOBBERS7 EV_HCALL_CLOBBERS8, "r10" +#define EV_HCALL_CLOBBERS6 EV_HCALL_CLOBBERS7, "r9" +#define EV_HCALL_CLOBBERS5 EV_HCALL_CLOBBERS6, "r8" +#define EV_HCALL_CLOBBERS4 EV_HCALL_CLOBBERS5, "r7" +#define EV_HCALL_CLOBBERS3 EV_HCALL_CLOBBERS4, "r6" +#define EV_HCALL_CLOBBERS2 EV_HCALL_CLOBBERS3, "r5" +#define EV_HCALL_CLOBBERS1 EV_HCALL_CLOBBERS2, "r4" + + +/* + * We use "uintptr_t" to define a register because it's guaranteed to be a + * 32-bit integer on a 32-bit platform, and a 64-bit integer on a 64-bit + * platform. + * + * All registers are either input/output or output only. Registers that are + * initialized before making the hypercall are input/output. All + * input/output registers are represented with "+r". Output-only registers + * are represented with "=r". Do not specify any unused registers. The + * clobber list will tell the compiler that the hypercall modifies those + * registers, which is good enough. + */ + +/** + * ev_int_set_config - configure the specified interrupt + * @interrupt: the interrupt number + * @config: configuration for this interrupt + * @priority: interrupt priority + * @destination: destination CPU number + * + * Returns 0 for success, or an error code. + */ +static inline unsigned int ev_int_set_config(unsigned int interrupt, + uint32_t config, unsigned int priority, uint32_t destination) +{ + register uintptr_t r11 __asm__("r11"); + register uintptr_t r3 __asm__("r3"); + register uintptr_t r4 __asm__("r4"); + register uintptr_t r5 __asm__("r5"); + register uintptr_t r6 __asm__("r6"); + + r11 = EV_HCALL_TOKEN(EV_INT_SET_CONFIG); + r3 = interrupt; + r4 = config; + r5 = priority; + r6 = destination; + + __asm__ __volatile__ ("sc 1" + : "+r" (r11), "+r" (r3), "+r" (r4), "+r" (r5), "+r" (r6) + : : EV_HCALL_CLOBBERS4 + ); + + return r3; +} + +/** + * ev_int_get_config - return the config of the specified interrupt + * @interrupt: the interrupt number + * @config: returned configuration for this interrupt + * @priority: returned interrupt priority + * @destination: returned destination CPU number + * + * Returns 0 for success, or an error code. + */ +static inline unsigned int ev_int_get_config(unsigned int interrupt, + uint32_t *config, unsigned int *priority, uint32_t *destination) +{ + register uintptr_t r11 __asm__("r11"); + register uintptr_t r3 __asm__("r3"); + register uintptr_t r4 __asm__("r4"); + register uintptr_t r5 __asm__("r5"); + register uintptr_t r6 __asm__("r6"); + + r11 = EV_HCALL_TOKEN(EV_INT_GET_CONFIG); + r3 = interrupt; + + __asm__ __volatile__ ("sc 1" + : "+r" (r11), "+r" (r3), "=r" (r4), "=r" (r5), "=r" (r6) + : : EV_HCALL_CLOBBERS4 + ); + + *config = r4; + *priority = r5; + *destination = r6; + + return r3; +} + +/** + * ev_int_set_mask - sets the mask for the specified interrupt source + * @interrupt: the interrupt number + * @mask: 0=enable interrupts, 1=disable interrupts + * + * Returns 0 for success, or an error code. + */ +static inline unsigned int ev_int_set_mask(unsigned int interrupt, + unsigned int mask) +{ + register uintptr_t r11 __asm__("r11"); + register uintptr_t r3 __asm__("r3"); + register uintptr_t r4 __asm__("r4"); + + r11 = EV_HCALL_TOKEN(EV_INT_SET_MASK); + r3 = interrupt; + r4 = mask; + + __asm__ __volatile__ ("sc 1" + : "+r" (r11), "+r" (r3), "+r" (r4) + : : EV_HCALL_CLOBBERS2 + ); + + return r3; +} + +/** + * ev_int_get_mask - returns the mask for the specified interrupt source + * @interrupt: the interrupt number + * @mask: returned mask for this interrupt (0=enabled, 1=disabled) + * + * Returns 0 for success, or an error code. + */ +static inline unsigned int ev_int_get_mask(unsigned int interrupt, + unsigned int *mask) +{ + register uintptr_t r11 __asm__("r11"); + register uintptr_t r3 __asm__("r3"); + register uintptr_t r4 __asm__("r4"); + + r11 = EV_HCALL_TOKEN(EV_INT_GET_MASK); + r3 = interrupt; + + __asm__ __volatile__ ("sc 1" + : "+r" (r11), "+r" (r3), "=r" (r4) + : : EV_HCALL_CLOBBERS2 + ); + + *mask = r4; + + return r3; +} + +/** + * ev_int_eoi - signal the end of interrupt processing + * @interrupt: the interrupt number + * + * This function signals the end of processing for the the specified + * interrupt, which must be the interrupt currently in service. By + * definition, this is also the highest-priority interrupt. + * + * Returns 0 for success, or an error code. + */ +static inline unsigned int ev_int_eoi(unsigned int interrupt) +{ + register uintptr_t r11 __asm__("r11"); + register uintptr_t r3 __asm__("r3"); + + r11 = EV_HCALL_TOKEN(EV_INT_EOI); + r3 = interrupt; + + __asm__ __volatile__ ("sc 1" + : "+r" (r11), "+r" (r3) + : : EV_HCALL_CLOBBERS1 + ); + + return r3; +} + +/** + * ev_byte_channel_send - send characters to a byte stream + * @handle: byte stream handle + * @count: (input) num of chars to send, (output) num chars sent + * @buffer: pointer to a 16-byte buffer + * + * @buffer must be at least 16 bytes long, because all 16 bytes will be + * read from memory into registers, even if count < 16. + * + * Returns 0 for success, or an error code. + */ +static inline unsigned int ev_byte_channel_send(unsigned int handle, + unsigned int *count, const char buffer[EV_BYTE_CHANNEL_MAX_BYTES]) +{ + register uintptr_t r11 __asm__("r11"); + register uintptr_t r3 __asm__("r3"); + register uintptr_t r4 __asm__("r4"); + register uintptr_t r5 __asm__("r5"); + register uintptr_t r6 __asm__("r6"); + register uintptr_t r7 __asm__("r7"); + register uintptr_t r8 __asm__("r8"); + const uint32_t *p = (const uint32_t *) buffer; + + r11 = EV_HCALL_TOKEN(EV_BYTE_CHANNEL_SEND); + r3 = handle; + r4 = *count; + r5 = be32_to_cpu(p[0]); + r6 = be32_to_cpu(p[1]); + r7 = be32_to_cpu(p[2]); + r8 = be32_to_cpu(p[3]); + + __asm__ __volatile__ ("sc 1" + : "+r" (r11), "+r" (r3), + "+r" (r4), "+r" (r5), "+r" (r6), "+r" (r7), "+r" (r8) + : : EV_HCALL_CLOBBERS6 + ); + + *count = r4; + + return r3; +} + +/** + * ev_byte_channel_receive - fetch characters from a byte channel + * @handle: byte channel handle + * @count: (input) max num of chars to receive, (output) num chars received + * @buffer: pointer to a 16-byte buffer + * + * The size of @buffer must be at least 16 bytes, even if you request fewer + * than 16 characters, because we always write 16 bytes to @buffer. This is + * for performance reasons. + * + * Returns 0 for success, or an error code. + */ +static inline unsigned int ev_byte_channel_receive(unsigned int handle, + unsigned int *count, char buffer[EV_BYTE_CHANNEL_MAX_BYTES]) +{ + register uintptr_t r11 __asm__("r11"); + register uintptr_t r3 __asm__("r3"); + register uintptr_t r4 __asm__("r4"); + register uintptr_t r5 __asm__("r5"); + register uintptr_t r6 __asm__("r6"); + register uintptr_t r7 __asm__("r7"); + register uintptr_t r8 __asm__("r8"); + uint32_t *p = (uint32_t *) buffer; + + r11 = EV_HCALL_TOKEN(EV_BYTE_CHANNEL_RECEIVE); + r3 = handle; + r4 = *count; + + __asm__ __volatile__ ("sc 1" + : "+r" (r11), "+r" (r3), "+r" (r4), + "=r" (r5), "=r" (r6), "=r" (r7), "=r" (r8) + : : EV_HCALL_CLOBBERS6 + ); + + *count = r4; + p[0] = cpu_to_be32(r5); + p[1] = cpu_to_be32(r6); + p[2] = cpu_to_be32(r7); + p[3] = cpu_to_be32(r8); + + return r3; +} + +/** + * ev_byte_channel_poll - returns the status of the byte channel buffers + * @handle: byte channel handle + * @rx_count: returned count of bytes in receive queue + * @tx_count: returned count of free space in transmit queue + * + * This function reports the amount of data in the receive queue (i.e. the + * number of bytes you can read), and the amount of free space in the transmit + * queue (i.e. the number of bytes you can write). + * + * Returns 0 for success, or an error code. + */ +static inline unsigned int ev_byte_channel_poll(unsigned int handle, + unsigned int *rx_count, unsigned int *tx_count) +{ + register uintptr_t r11 __asm__("r11"); + register uintptr_t r3 __asm__("r3"); + register uintptr_t r4 __asm__("r4"); + register uintptr_t r5 __asm__("r5"); + + r11 = EV_HCALL_TOKEN(EV_BYTE_CHANNEL_POLL); + r3 = handle; + + __asm__ __volatile__ ("sc 1" + : "+r" (r11), "+r" (r3), "=r" (r4), "=r" (r5) + : : EV_HCALL_CLOBBERS3 + ); + + *rx_count = r4; + *tx_count = r5; + + return r3; +} + +/** + * ev_int_iack - acknowledge an interrupt + * @handle: handle to the target interrupt controller + * @vector: returned interrupt vector + * + * If handle is zero, the function returns the next interrupt source + * number to be handled irrespective of the hierarchy or cascading + * of interrupt controllers. If non-zero, specifies a handle to the + * interrupt controller that is the target of the acknowledge. + * + * Returns 0 for success, or an error code. + */ +static inline unsigned int ev_int_iack(unsigned int handle, + unsigned int *vector) +{ + register uintptr_t r11 __asm__("r11"); + register uintptr_t r3 __asm__("r3"); + register uintptr_t r4 __asm__("r4"); + + r11 = EV_HCALL_TOKEN(EV_INT_IACK); + r3 = handle; + + __asm__ __volatile__ ("sc 1" + : "+r" (r11), "+r" (r3), "=r" (r4) + : : EV_HCALL_CLOBBERS2 + ); + + *vector = r4; + + return r3; +} + +/** + * ev_doorbell_send - send a doorbell to another partition + * @handle: doorbell send handle + * + * Returns 0 for success, or an error code. + */ +static inline unsigned int ev_doorbell_send(unsigned int handle) +{ + register uintptr_t r11 __asm__("r11"); + register uintptr_t r3 __asm__("r3"); + + r11 = EV_HCALL_TOKEN(EV_DOORBELL_SEND); + r3 = handle; + + __asm__ __volatile__ ("sc 1" + : "+r" (r11), "+r" (r3) + : : EV_HCALL_CLOBBERS1 + ); + + return r3; +} + +/** + * ev_idle -- wait for next interrupt on this core + * + * Returns 0 for success, or an error code. + */ +static inline unsigned int ev_idle(void) +{ + register uintptr_t r11 __asm__("r11"); + register uintptr_t r3 __asm__("r3"); + + r11 = EV_HCALL_TOKEN(EV_IDLE); + + __asm__ __volatile__ ("sc 1" + : "+r" (r11), "=r" (r3) + : : EV_HCALL_CLOBBERS1 + ); + + return r3; +} + +#endif |