riscv-trap-handling: Add implementation for trap calls in riscv

RISCV requires the bios/bootloader to set up an interface by which it
can get information about memory, talk to host devices, etc. Put
implementation for spike in
src/mainboard/emulation/spike-riscv/spike_util.c, and
src/arch/riscv/trap_handler.c

Change-Id: Ie1d5f361595e48fa6cc1fac25485ad623ecdc717
Signed-off-by: Thaminda Edirisooriya <thaminda@google.com>
Reviewed-on: http://review.coreboot.org/11368
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

3 files changed, 105 insertions, 0 deletions

diff --git a/src/arch/riscv/include/arch/errno.h b/src/arch/riscv/include/arch/errno.h
new file mode 100644
index 0000000000..6f80ee5afd
--- /dev/null
+++ b/src/arch/riscv/include/arch/errno.h
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2013, The Regents of the University of California (Regents).
+ * All Rights Reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ * 3. Neither the name of the Regents nor the
+ * names of its contributors may be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * IN NO EVENT SHALL REGENTS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
+ * SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING
+ * OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF REGENTS HAS
+ * BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * REGENTS SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE. THE SOFTWARE AND ACCOMPANYING DOCUMENTATION, IF ANY, PROVIDED
+ * HEREUNDER IS PROVIDED "AS IS". REGENTS HAS NO OBLIGATION TO PROVIDE
+ * MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ */
+
+#ifndef _RISCV_ERRNO_BASE_H
+#define _RISCV_ERRNO_BASE_H
+
+#define EPERM        1  /* Operation not permitted */
+#define ENOENT       2  /* No such file or directory */
+#define ESRCH        3  /* No such process */
+#define EINTR        4  /* Interrupted system call */
+#define EIO      5  /* I/O error */
+#define ENXIO        6  /* No such device or address */
+#define E2BIG        7  /* Argument list too long */
+#define ENOEXEC      8  /* Exec format error */
+#define EBADF        9  /* Bad file number */
+#define ECHILD      10  /* No child processes */
+#define EAGAIN      11  /* Try again */
+#define ENOMEM      12  /* Out of memory */
+#define EACCES      13  /* Permission denied */
+#define EFAULT      14  /* Bad address */
+#define ENOTBLK     15  /* Block device required */
+#define EBUSY       16  /* Device or resource busy */
+#define EEXIST      17  /* File exists */
+#define EXDEV       18  /* Cross-device link */
+#define ENODEV      19  /* No such device */
+#define ENOTDIR     20  /* Not a directory */
+#define EISDIR      21  /* Is a directory */
+#define EINVAL      22  /* Invalid argument */
+#define ENFILE      23  /* File table overflow */
+#define EMFILE      24  /* Too many open files */
+#define ENOTTY      25  /* Not a typewriter */
+#define ETXTBSY     26  /* Text file busy */
+#define EFBIG       27  /* File too large */
+#define ENOSPC      28  /* No space left on device */
+#define ESPIPE      29  /* Illegal seek */
+#define EROFS       30  /* Read-only file system */
+#define EMLINK      31  /* Too many links */
+#define EPIPE       32  /* Broken pipe */
+#define EDOM        33  /* Math argument out of domain of func */
+#define ERANGE      34  /* Math result not representable */
+
+#endif
diff --git a/src/arch/riscv/include/arch/exception.h b/src/arch/riscv/include/arch/exception.h
index befab1f1a3..4318cba8b6 100644
--- a/src/arch/riscv/include/arch/exception.h
+++ b/src/arch/riscv/include/arch/exception.h
@@ -32,8 +32,30 @@
 
 #include <stdint.h>
 
+typedef struct
+{
+	uintptr_t gpr[32];
+	uintptr_t status;
+	uintptr_t epc;
+	uintptr_t badvaddr;
+	uintptr_t cause;
+	uintptr_t insn;
+} trapframe;
+
+typedef uint32_t insn_t;
+
+typedef struct {
+	uintptr_t error;
+	insn_t insn;
+} insn_fetch_t;
+
 static inline void exception_init(void)
 {
 }
 
+void trap_handler(trapframe* tf);
+void handle_supervisor_call(trapframe* tf);
+//void handleMisalignedLoad(trapframe *tf);
+void handle_misaligned_store(trapframe *tf);
+
 #endif
diff --git a/src/arch/riscv/include/spike_util.h b/src/arch/riscv/include/spike_util.h
index a9d14cccf1..e9c0300aaa 100644
--- a/src/arch/riscv/include/spike_util.h
+++ b/src/arch/riscv/include/spike_util.h
@@ -40,6 +40,12 @@
 #define FROMHOST_DATA(fromhost_value) ((uint64_t)(fromhost_value) << 16 >> 16)
 
 typedef struct {
+  unsigned long base;
+  unsigned long size;
+  unsigned long node_id;
+} memory_block_info;
+
+typedef struct {
   unsigned long dev;
   unsigned long cmd;
   unsigned long data;
@@ -63,11 +69,22 @@ typedef struct {
 
 // hart-local storage, at top of stack
 #define HLS() ((hls_t*)(MACHINE_STACK_TOP() - HLS_SIZE))
+#define OTHER_HLS(id) ((hls_t*)((void*)HLS() + RISCV_PGSIZE * ((id) - HLS()->hart_id)))
 
 #define MACHINE_STACK_SIZE RISCV_PGSIZE
 
+uintptr_t translate_address(uintptr_t vAddr);
+uintptr_t mcall_query_memory(uintptr_t id, memory_block_info *p);
+uintptr_t mcall_hart_id(void);
 uintptr_t htif_interrupt(uintptr_t mcause, uintptr_t* regs);
 uintptr_t mcall_console_putchar(uint8_t ch);
 void testPrint(void);
+uintptr_t mcall_dev_req(sbi_device_message *m);
+uintptr_t mcall_dev_resp(void);
+uintptr_t mcall_set_timer(unsigned long long when);
+uintptr_t mcall_clear_ipi(void);
+uintptr_t mcall_send_ipi(uintptr_t recipient);
+uintptr_t mcall_shutdown(void);
+void hls_init(uint32_t hart_id); // need to call this before launching linux
 
 #endif