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authorXiang Wang <wxjstz@126.com>2018-08-01 12:36:14 +0800
committerPatrick Georgi <pgeorgi@google.com>2018-09-05 10:03:40 +0000
commitce1af8b0bf8569ad2d0ebc7bc7b0babe1579c7f2 (patch)
tree14f28736ca3b1e00f7b4819c248e41123b69cc4b /src/arch/riscv
parentee0f225e3a4ad89af5aeb2ee623d97ffc5c456fe (diff)
downloadcoreboot-ce1af8b0bf8569ad2d0ebc7bc7b0babe1579c7f2.tar.xz
riscv: add support to check machine length at runtime
Highest two bits of misa can be used to check machine length. Add code to support this. Change-Id: I3bab301d38ea8aabf2c70437e179287814298b25 Signed-off-by: Xiang Wang <wxjstz@126.com> Reviewed-on: https://review.coreboot.org/27770 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Diffstat (limited to 'src/arch/riscv')
-rw-r--r--src/arch/riscv/include/arch/cpu.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/arch/riscv/include/arch/cpu.h b/src/arch/riscv/include/arch/cpu.h
index 6008c75122..d2f42a8665 100644
--- a/src/arch/riscv/include/arch/cpu.h
+++ b/src/arch/riscv/include/arch/cpu.h
@@ -51,5 +51,11 @@ static inline int supports_extension(char ext)
return read_csr(misa) & (1 << (ext - 'A'));
}
+static inline int machine_xlen(void)
+{
+ int mxl = (read_csr(misa) >> (__riscv_xlen - 2)) & 3;
+ return (1 << mxl) * 16;
+}
+
struct cpu_info *cpu_info(void);
#endif /* __ARCH_CPU_H__ */