Add riscv64 support

Signed-off-by: Andrea Bolognani <abologna@redhat.com>

0281-loader-efi-Fix-RISC-V-build.patch

@@ -0,0 +1,72 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Andrea Bolognani <abologna@redhat.com>
+Date: Tue, 19 Nov 2024 15:42:01 +0000
+Subject: [PATCH] loader/efi: Fix RISC-V build
+
+Some struct definitions are currently limited to 32-bit and
+64-bit Arm architectures, but they actually apply to other
+architectures as well, specifically 32-bit and 64-bit RISC-V
+respectively.
+
+Update the preprocessor checks guarding their definition, and
+change their names to make them more accurate by replacing the
+word "arm" with the word "efi".
+
+Signed-off-by: Andrea Bolognani <abologna@redhat.com>
+---
+ grub-core/loader/efi/linux.c |  2 +-
+ include/grub/efi/efi.h       | 12 ++++++------
+ 2 files changed, 7 insertions(+), 7 deletions(-)
+
+diff --git a/grub-core/loader/efi/linux.c b/grub-core/loader/efi/linux.c
+index 5889e3f36f8..ef55556f2d9 100644
+--- a/grub-core/loader/efi/linux.c
++++ b/grub-core/loader/efi/linux.c
+@@ -684,7 +684,7 @@ parse_pe_header (void *kernel, grub_uint64_t *total_size,
+ 		 grub_uint32_t *alignment, grub_uint32_t *code_size)
+ {
+   struct linux_arch_kernel_header *lh = kernel;
+-  struct grub_armxx_linux_pe_header *pe;
++  struct grub_efixx_linux_pe_header *pe;
+   grub_uint16_t i;
+   struct grub_pe32_section_table *sections;
+ 
+diff --git a/include/grub/efi/efi.h b/include/grub/efi/efi.h
+index 7eed1bd791d..81daf6bead1 100644
+--- a/include/grub/efi/efi.h
++++ b/include/grub/efi/efi.h
+@@ -36,28 +36,28 @@ struct linux_arch_kernel_header {
+   struct grub_pe_image_header pe_image_header;
+ };
+ 
+-struct grub_arm_linux_pe_header
++struct grub_efi32_linux_pe_header
+ {
+   grub_uint32_t magic;
+   struct grub_pe32_coff_header coff;
+   struct grub_pe32_optional_header opt;
+ };
+ 
+-struct grub_arm64_linux_pe_header
++struct grub_efi64_linux_pe_header
+ {
+   grub_uint32_t magic;
+   struct grub_pe32_coff_header coff;
+   struct grub_pe64_optional_header opt;
+ };
+ 
+-#if defined(__arm__)
++#if defined(__arm__) || (defined(__riscv) && (__riscv_xlen == 32))
+ # define GRUB_PE32_PEXX_MAGIC GRUB_PE32_PE32_MAGIC
+-# define grub_armxx_linux_pe_header grub_arm_linux_pe_header
++# define grub_efixx_linux_pe_header grub_efi32_linux_pe_header
+ #endif
+ 
+-#if defined(__aarch64__)
++#if defined(__aarch64__) || (defined(__riscv) && (__riscv_xlen == 64))
+ # define GRUB_PE32_PEXX_MAGIC GRUB_PE32_PE64_MAGIC
+-# define grub_armxx_linux_pe_header grub_arm64_linux_pe_header
++# define grub_efixx_linux_pe_header grub_efi64_linux_pe_header
+ #endif
+ 
+ #define GRUB_EFI_GRUB_VARIABLE_GUID             \

0282-kern-riscv-efi-init-Use-time-register-in-grub_efi_ge.patch

@@ -0,0 +1,44 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
+Date: Mon, 12 Aug 2024 16:13:18 +0200
+Subject: [PATCH] kern/riscv/efi/init: Use time register in
+ grub_efi_get_time_ms()
+
+The cycle register is not guaranteed to count at constant frequency.
+If it is counting at all depends on the state the performance monitoring
+unit. Use the time register to measure time.
+
+Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
+Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
+---
+ grub-core/kern/riscv/efi/init.c | 15 +++++++--------
+ 1 file changed, 7 insertions(+), 8 deletions(-)
+
+diff --git a/grub-core/kern/riscv/efi/init.c b/grub-core/kern/riscv/efi/init.c
+index 38795fe6741..0d7de4f541a 100644
+--- a/grub-core/kern/riscv/efi/init.c
++++ b/grub-core/kern/riscv/efi/init.c
+@@ -33,16 +33,15 @@ grub_efi_get_time_ms (void)
+   grub_uint64_t tmr;
+ 
+ #if __riscv_xlen == 64
+-  asm volatile ("rdcycle %0" : "=r" (tmr));
++  asm volatile ("rdtime %0" : "=r"(tmr));
+ #else
+   grub_uint32_t lo, hi, tmp;
+-  asm volatile (
+-    "1:\n"
+-    "rdcycleh %0\n"
+-    "rdcycle %1\n"
+-    "rdcycleh %2\n"
+-    "bne %0, %2, 1b"
+-    : "=&r" (hi), "=&r" (lo), "=&r" (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 = ((grub_uint64_t)hi << 32) | lo;
+ #endif
+ 

0283-Use-medany-instead-of-large-model-for-RISCV.patch

@@ -0,0 +1,36 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Jason Montleon <jason@montleon.com>
+Date: Fri, 3 May 2024 13:18:37 -0400
+Subject: [PATCH] Use medany instead of large model for RISCV
+
+Signed-off-by: Jason Montleon <jason@montleon.com>
+---
+ configure.ac | 6 ++++--
+ 1 file changed, 4 insertions(+), 2 deletions(-)
+
+diff --git a/configure.ac b/configure.ac
+index 4788f3d6adc..a6a6957fbdb 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -1313,7 +1313,7 @@ AC_SUBST(TARGET_LDFLAGS_OLDMAGIC)
+ 
+ LDFLAGS="$TARGET_LDFLAGS"
+ 
+-if test "$target_cpu" = x86_64 || test "$target_cpu" = sparc64 || test "$target_cpu" = riscv64 ; then
++if test "$target_cpu" = x86_64 || test "$target_cpu" = sparc64 ; then
+   # Use large model to support 4G memory
+   AC_CACHE_CHECK([whether option -mcmodel=large works], grub_cv_cc_mcmodel, [
+     CFLAGS="$TARGET_CFLAGS -mcmodel=large"
+@@ -1323,9 +1323,11 @@ if test "$target_cpu" = x86_64 || test "$target_cpu" = sparc64 || test "$target_
+   ])
+   if test "x$grub_cv_cc_mcmodel" = xyes; then
+     TARGET_CFLAGS="$TARGET_CFLAGS -mcmodel=large"
+-  elif test "$target_cpu" = sparc64 || test "$target_cpu" = riscv64; then
++  elif test "$target_cpu" = sparc64; then
+     TARGET_CFLAGS="$TARGET_CFLAGS -mcmodel=medany"
+   fi
++elif test "$target_cpu" = riscv64 ; then
++    TARGET_CFLAGS="$TARGET_CFLAGS -mcmodel=medany"
+ fi
+ 
+ if test "$target_cpu"-"$platform" = x86_64-efi; then

grub.patches

@@ -278,3 +278,6 @@ Patch0277: 0277-Stop-grub.efi-from-always-printing-dynamic_load_symb.patch
 Patch0278: 0278-acpi-Fix-out-of-bounds-access-in-grub_acpi_xsdt_find.patch
 Patch0279: 0279-cmd-search-Fix-a-possible-NULL-ptr-dereference.patch
 Patch0280: 0280-Enable-building-blscfg-module-on-xen-and-xen_pvh.patch
+Patch0281: 0281-loader-efi-Fix-RISC-V-build.patch
+Patch0282: 0282-kern-riscv-efi-init-Use-time-register-in-grub_efi_ge.patch
+Patch0283: 0283-Use-medany-instead-of-large-model-for-RISCV.patch

grub2.spec

@@ -17,7 +17,7 @@
 Name:		grub2
 Epoch:		1
 Version:	2.12
-Release:	14%{?dist}
+Release:	15%{?dist}
 Summary:	Bootloader with support for Linux, Multiboot and more
 License:	GPL-3.0-or-later
 URL:		http://www.gnu.org/software/grub/
@@ -602,6 +602,9 @@ mv ${EFI_HOME}/grub.cfg.stb ${EFI_HOME}/grub.cfg
 %endif
 
 %changelog
+* Thu Nov 21 2024 Andrea Bolognani <abologna@redhat.com> 2.12-15
+- Add riscv64 support (thanks Jason Montleon)
+
 * Wed Nov 20 2024 Nicolas Frayer <nfrayer@redhat.com> 2.12-14
 - Build modules for Xen PV and PVH