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+/*
+ * 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 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 <uapi/asm/epapr_hcalls.h>
+
+#ifndef __ASSEMBLY__
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <asm/byteorder.h>
+
+/*
+ * 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.
+ *
+ * The "memory" clobber is only necessary for hcalls where the Hypervisor
+ * will read or write guest memory. However, we add it to all hcalls because
+ * the impact is minimal, and we want to ensure that it's present for the
+ * hcalls that need it.
+*/
+
+/* List of common clobbered registers. Do not use this macro. */
+#define EV_HCALL_CLOBBERS "r0", "r12", "xer", "ctr", "lr", "cc", "memory"
+
+#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"
+
+extern bool epapr_paravirt_enabled;
+extern u32 epapr_hypercall_start[];
+
+#ifdef CONFIG_EPAPR_PARAVIRT
+int __init epapr_paravirt_early_init(void);
+#else
+static inline int epapr_paravirt_early_init(void) { return 0; }
+#endif
+
+/*
+ * 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("bl epapr_hypercall_start"
+ : "+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("bl epapr_hypercall_start"
+ : "+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("bl epapr_hypercall_start"
+ : "+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("bl epapr_hypercall_start"
+ : "+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 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("bl epapr_hypercall_start"
+ : "+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("bl epapr_hypercall_start"
+ : "+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("bl epapr_hypercall_start"
+ : "+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("bl epapr_hypercall_start"
+ : "+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("bl epapr_hypercall_start"
+ : "+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("bl epapr_hypercall_start"
+ : "+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("bl epapr_hypercall_start"
+ : "+r" (r11), "=r" (r3)
+ : : EV_HCALL_CLOBBERS1
+ );
+
+ return r3;
+}
+
+#ifdef CONFIG_EPAPR_PARAVIRT
+static inline unsigned long epapr_hypercall(unsigned long *in,
+ unsigned long *out,
+ unsigned long nr)
+{
+ register unsigned long r0 asm("r0");
+ register unsigned long r3 asm("r3") = in[0];
+ register unsigned long r4 asm("r4") = in[1];
+ register unsigned long r5 asm("r5") = in[2];
+ register unsigned long r6 asm("r6") = in[3];
+ register unsigned long r7 asm("r7") = in[4];
+ register unsigned long r8 asm("r8") = in[5];
+ register unsigned long r9 asm("r9") = in[6];
+ register unsigned long r10 asm("r10") = in[7];
+ register unsigned long r11 asm("r11") = nr;
+ register unsigned long r12 asm("r12");
+
+ asm volatile("bl epapr_hypercall_start"
+ : "=r"(r0), "=r"(r3), "=r"(r4), "=r"(r5), "=r"(r6),
+ "=r"(r7), "=r"(r8), "=r"(r9), "=r"(r10), "=r"(r11),
+ "=r"(r12)
+ : "r"(r3), "r"(r4), "r"(r5), "r"(r6), "r"(r7), "r"(r8),
+ "r"(r9), "r"(r10), "r"(r11)
+ : "memory", "cc", "xer", "ctr", "lr");
+
+ out[0] = r4;
+ out[1] = r5;
+ out[2] = r6;
+ out[3] = r7;
+ out[4] = r8;
+ out[5] = r9;
+ out[6] = r10;
+ out[7] = r11;
+
+ return r3;
+}
+#else
+static unsigned long epapr_hypercall(unsigned long *in,
+ unsigned long *out,
+ unsigned long nr)
+{
+ return EV_UNIMPLEMENTED;
+}
+#endif
+
+static inline long epapr_hypercall0_1(unsigned int nr, unsigned long *r2)
+{
+ unsigned long in[8] = {0};
+ unsigned long out[8];
+ unsigned long r;
+
+ r = epapr_hypercall(in, out, nr);
+ *r2 = out[0];
+
+ return r;
+}
+
+static inline long epapr_hypercall0(unsigned int nr)
+{
+ unsigned long in[8] = {0};
+ unsigned long out[8];
+
+ return epapr_hypercall(in, out, nr);
+}
+
+static inline long epapr_hypercall1(unsigned int nr, unsigned long p1)
+{
+ unsigned long in[8] = {0};
+ unsigned long out[8];
+
+ in[0] = p1;
+ return epapr_hypercall(in, out, nr);
+}
+
+static inline long epapr_hypercall2(unsigned int nr, unsigned long p1,
+ unsigned long p2)
+{
+ unsigned long in[8] = {0};
+ unsigned long out[8];
+
+ in[0] = p1;
+ in[1] = p2;
+ return epapr_hypercall(in, out, nr);
+}
+
+static inline long epapr_hypercall3(unsigned int nr, unsigned long p1,
+ unsigned long p2, unsigned long p3)
+{
+ unsigned long in[8] = {0};
+ unsigned long out[8];
+
+ in[0] = p1;
+ in[1] = p2;
+ in[2] = p3;
+ return epapr_hypercall(in, out, nr);
+}
+
+static inline long epapr_hypercall4(unsigned int nr, unsigned long p1,
+ unsigned long p2, unsigned long p3,
+ unsigned long p4)
+{
+ unsigned long in[8] = {0};
+ unsigned long out[8];
+
+ in[0] = p1;
+ in[1] = p2;
+ in[2] = p3;
+ in[3] = p4;
+ return epapr_hypercall(in, out, nr);
+}
+#endif /* !__ASSEMBLY__ */
+#endif /* _EPAPR_HCALLS_H */