[PATCH v2 08/10] RISC-V: Add auxiliary files

[Alexander Graf]

To support a new architecture we need to provide a few helper functions
for memory, cache, timer, etc support.

This patch adds the remainders of those. Some bits are still disabled,
as I couldn't guarantee that we're always running on models / in modes
where the respective hardware is available.

Signed-off-by: Alexander Graf <address@hidden>
---
 grub-core/kern/riscv/cache.c       | 64 +++++++++++++++++++++++++++++
 grub-core/kern/riscv/cache_flush.S | 40 +++++++++++++++++++
 grub-core/kern/riscv/efi/init.c    | 82 ++++++++++++++++++++++++++++++++++++++
 include/grub/riscv32/efi/memory.h  |  6 +++
 include/grub/riscv32/time.h        | 28 +++++++++++++
 include/grub/riscv32/types.h       | 34 ++++++++++++++++
 include/grub/riscv64/efi/memory.h  |  6 +++
 include/grub/riscv64/time.h        | 28 +++++++++++++
 include/grub/riscv64/types.h       | 34 ++++++++++++++++
 9 files changed, 322 insertions(+)
 create mode 100644 grub-core/kern/riscv/cache.c
 create mode 100644 grub-core/kern/riscv/cache_flush.S
 create mode 100644 grub-core/kern/riscv/efi/init.c
 create mode 100644 include/grub/riscv32/efi/memory.h
 create mode 100644 include/grub/riscv32/time.h
 create mode 100644 include/grub/riscv32/types.h
 create mode 100644 include/grub/riscv64/efi/memory.h
 create mode 100644 include/grub/riscv64/time.h
 create mode 100644 include/grub/riscv64/types.h

diff --git a/grub-core/kern/riscv/cache.c b/grub-core/kern/riscv/cache.c
new file mode 100644
index 000000000..5157fef10
--- /dev/null
+++ b/grub-core/kern/riscv/cache.c
@@ -0,0 +1,64 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/cache.h>
+#include <grub/misc.h>
+
+static grub_int64_t dlinesz;
+static grub_int64_t ilinesz;
+
+/* Prototypes for asm functions. */
+void grub_arch_clean_dcache_range (grub_addr_t beg, grub_addr_t end,
+                                  grub_uint64_t line_size);
+void grub_arch_invalidate_icache_range (grub_addr_t beg, grub_addr_t end,
+                                       grub_uint64_t line_size);
+
+static void
+probe_caches (void)
+{
+  /* TODO */
+  dlinesz = 32;
+  ilinesz = 32;
+}
+
+void
+grub_arch_sync_caches (void *address, grub_size_t len)
+{
+  grub_uint64_t start, end, max_align;
+
+  if (dlinesz == 0)
+    probe_caches();
+  if (dlinesz == 0)
+    grub_fatal ("Unknown cache line size!");
+
+  max_align = dlinesz > ilinesz ? dlinesz : ilinesz;
+
+  start = ALIGN_DOWN ((grub_uint64_t) address, max_align);
+  end = ALIGN_UP ((grub_uint64_t) address + len, max_align);
+
+  grub_arch_clean_dcache_range (start, end, dlinesz);
+  grub_arch_invalidate_icache_range (start, end, ilinesz);
+}
+
+void
+grub_arch_sync_dma_caches (volatile void *address, grub_size_t len)
+{
+  /* DMA incoherent devices not supported yet */
+  if (address || len || 1)
+    return;
+}
diff --git a/grub-core/kern/riscv/cache_flush.S 
b/grub-core/kern/riscv/cache_flush.S
new file mode 100644
index 000000000..033a8aac3
--- /dev/null
+++ b/grub-core/kern/riscv/cache_flush.S
@@ -0,0 +1,40 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/symbol.h>
+
+       .file   "cache_flush.S"
+       .text
+
+/*
+ * Simple cache maintenance functions
+ */
+
+// a0 - *beg (inclusive)
+// a1 - *end (exclusive)
+// a2 - line size
+FUNCTION(grub_arch_clean_dcache_range)
+       // TODO
+       ret
+
+// a0 - *beg (inclusive)
+// a1 - *end (exclusive)
+// a2 - line size
+FUNCTION(grub_arch_invalidate_icache_range)
+       // TODO
+       ret
diff --git a/grub-core/kern/riscv/efi/init.c b/grub-core/kern/riscv/efi/init.c
new file mode 100644
index 000000000..199de08a7
--- /dev/null
+++ b/grub-core/kern/riscv/efi/init.c
@@ -0,0 +1,82 @@
+/* init.c - initialize a riscv-based EFI system */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013 Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/env.h>
+#include <grub/kernel.h>
+#include <grub/misc.h>
+#include <grub/mm.h>
+#include <grub/time.h>
+#include <grub/efi/efi.h>
+#include <grub/loader.h>
+
+static grub_uint64_t timer_frequency_in_khz;
+
+static grub_uint64_t
+grub_efi_get_time_ms (void)
+{
+  grub_uint64_t tmr;
+
+#if 0
+#if __riscv_xlen == 64
+  asm volatile ("rdtime %0" : "=r" (tmr));
+#else
+  grub_uint32_t lo, hi, tmp;
+  asm volatile (
+    "1:\n"
+    "rdtimeh %0\n"
+    "rdtime %1\n"
+    "rdtimeh %2\n"
+    "bne %0, %2, 1b"
+    : "=&r" (hi), "=&r" (lo), "=&r" (tmp));
+  tmr = ((u64)hi << 32) | lo;
+#endif
+#else
+  static grub_uint64_t val;
+  tmr = val++;
+#endif
+
+  return tmr / timer_frequency_in_khz;
+}
+
+
+void
+grub_machine_init (void)
+{
+  grub_uint64_t time_before, time_after;
+
+  grub_efi_init ();
+
+  /* Calculate timer frequency */
+  timer_frequency_in_khz = 1;
+  time_before = grub_efi_get_time_ms();
+  grub_efi_stall(1000);
+  time_after = grub_efi_get_time_ms();
+  timer_frequency_in_khz = time_after - time_before;
+
+  grub_install_get_time_ms (grub_efi_get_time_ms);
+}
+
+void
+grub_machine_fini (int flags)
+{
+  if (!(flags & GRUB_LOADER_FLAG_NORETURN))
+    return;
+
+  grub_efi_fini ();
+}
diff --git a/include/grub/riscv32/efi/memory.h 
b/include/grub/riscv32/efi/memory.h
new file mode 100644
index 000000000..e61c474ff
--- /dev/null
+++ b/include/grub/riscv32/efi/memory.h
@@ -0,0 +1,6 @@
+#ifndef GRUB_MEMORY_CPU_HEADER
+#include <grub/efi/memory.h>
+
+#define GRUB_EFI_MAX_USABLE_ADDRESS 0xffffffffUL
+
+#endif /* ! GRUB_MEMORY_CPU_HEADER */
diff --git a/include/grub/riscv32/time.h b/include/grub/riscv32/time.h
new file mode 100644
index 000000000..f9546ec0e
--- /dev/null
+++ b/include/grub/riscv32/time.h
@@ -0,0 +1,28 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef KERNEL_CPU_TIME_HEADER
+#define KERNEL_CPU_TIME_HEADER 1
+
+static __inline void
+grub_cpu_idle (void)
+{
+  /* TODO */
+}
+
+#endif /* ! KERNEL_CPU_TIME_HEADER */
diff --git a/include/grub/riscv32/types.h b/include/grub/riscv32/types.h
new file mode 100644
index 000000000..8c90ce2ec
--- /dev/null
+++ b/include/grub/riscv32/types.h
@@ -0,0 +1,34 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GRUB_TYPES_CPU_HEADER
+#define GRUB_TYPES_CPU_HEADER  1
+
+/* The size of void *.  */
+#define GRUB_TARGET_SIZEOF_VOID_P      4
+
+/* The size of long.  */
+#define GRUB_TARGET_SIZEOF_LONG                4
+
+/* currently only support little-endian.  */
+#undef GRUB_TARGET_WORDS_BIGENDIAN
+
+/* Unaligned accesses can be very slow, so avoid them */
+#undef GRUB_HAVE_UNALIGNED_ACCESS
+
+#endif /* ! GRUB_TYPES_CPU_HEADER */
diff --git a/include/grub/riscv64/efi/memory.h 
b/include/grub/riscv64/efi/memory.h
new file mode 100644
index 000000000..c6cb32417
--- /dev/null
+++ b/include/grub/riscv64/efi/memory.h
@@ -0,0 +1,6 @@
+#ifndef GRUB_MEMORY_CPU_HEADER
+#include <grub/efi/memory.h>
+
+#define GRUB_EFI_MAX_USABLE_ADDRESS 0xffffffffffffULL
+
+#endif /* ! GRUB_MEMORY_CPU_HEADER */
diff --git a/include/grub/riscv64/time.h b/include/grub/riscv64/time.h
new file mode 100644
index 000000000..f9546ec0e
--- /dev/null
+++ b/include/grub/riscv64/time.h
@@ -0,0 +1,28 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef KERNEL_CPU_TIME_HEADER
+#define KERNEL_CPU_TIME_HEADER 1
+
+static __inline void
+grub_cpu_idle (void)
+{
+  /* TODO */
+}
+
+#endif /* ! KERNEL_CPU_TIME_HEADER */
diff --git a/include/grub/riscv64/types.h b/include/grub/riscv64/types.h
new file mode 100644
index 000000000..8823bc7d8
--- /dev/null
+++ b/include/grub/riscv64/types.h
@@ -0,0 +1,34 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GRUB_TYPES_CPU_HEADER
+#define GRUB_TYPES_CPU_HEADER  1
+
+/* The size of void *.  */
+#define GRUB_TARGET_SIZEOF_VOID_P      8
+
+/* The size of long.  */
+#define GRUB_TARGET_SIZEOF_LONG                8
+
+/* currently only support little-endian.  */
+#undef GRUB_TARGET_WORDS_BIGENDIAN
+
+/* Unaligned accesses can be very slow, so avoid them */
+#undef GRUB_HAVE_UNALIGNED_ACCESS
+
+#endif /* ! GRUB_TYPES_CPU_HEADER */
-- 
2.12.3