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riscv: add run mode configuration for SPL

U-Boot SPL can be run in a different privilege mode from U-Boot proper.
Add new configuration entries for SPL to allow the run mode to be
configured independently of U-Boot proper.

Extend all uses of the CONFIG_RISCV_SMODE and CONFIG_RISCV_MMODE
configuration symbols to also cover the SPL equivalents. Ensure that
files compatible with only one privilege mode are not included in builds
targeting an incompatible privilege mode.

Signed-off-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
Lukas Auer преди 4 години
родител
ревизия
fbfd92bf9b
променени са 7 файла, в които са добавени 44 реда и са изтрити 18 реда
  1. 28 5
      arch/riscv/Kconfig
  2. 3 3
      arch/riscv/cpu/ax25/Kconfig
  3. 3 3
      arch/riscv/cpu/cpu.c
  4. 1 1
      arch/riscv/cpu/generic/Kconfig
  5. 3 3
      arch/riscv/cpu/start.S
  6. 1 1
      arch/riscv/include/asm/encoding.h
  7. 5 2
      arch/riscv/lib/Makefile

+ 28 - 5
arch/riscv/Kconfig

@@ -113,6 +113,23 @@ config RISCV_SMODE
 
 endchoice
 
+choice
+	prompt "SPL Run Mode"
+	default SPL_RISCV_MMODE
+	depends on SPL
+
+config SPL_RISCV_MMODE
+	bool "Machine"
+	help
+	  Choose this option to build U-Boot SPL for RISC-V M-Mode.
+
+config SPL_RISCV_SMODE
+	bool "Supervisor"
+	help
+	  Choose this option to build U-Boot SPL for RISC-V S-Mode.
+
+endchoice
+
 config RISCV_ISA_C
 	bool "Emit compressed instructions"
 	default y
@@ -132,34 +149,40 @@ config 64BIT
 
 config SIFIVE_CLINT
 	bool
-	depends on RISCV_MMODE
+	depends on RISCV_MMODE || SPL_RISCV_MMODE
 	select REGMAP
 	select SYSCON
+	select SPL_REGMAP if SPL
+	select SPL_SYSCON if SPL
 	help
 	  The SiFive CLINT block holds memory-mapped control and status registers
 	  associated with software and timer interrupts.
 
 config ANDES_PLIC
 	bool
-	depends on RISCV_MMODE
+	depends on RISCV_MMODE || SPL_RISCV_MMODE
 	select REGMAP
 	select SYSCON
+	select SPL_REGMAP if SPL
+	select SPL_SYSCON if SPL
 	help
 	  The Andes PLIC block holds memory-mapped claim and pending registers
 	  associated with software interrupt.
 
 config ANDES_PLMT
 	bool
-	depends on RISCV_MMODE
+	depends on RISCV_MMODE || SPL_RISCV_MMODE
 	select REGMAP
 	select SYSCON
+	select SPL_REGMAP if SPL
+	select SPL_SYSCON if SPL
 	help
 	  The Andes PLMT block holds memory-mapped mtime register
 	  associated with timer tick.
 
 config RISCV_RDTIME
 	bool
-	default y if RISCV_SMODE
+	default y if RISCV_SMODE || SPL_RISCV_SMODE
 	help
 	  The provides the riscv_get_time() API that is implemented using the
 	  standard rdtime instruction. This is the case for S-mode U-Boot, and
@@ -189,7 +212,7 @@ config NR_CPUS
 
 config SBI_IPI
 	bool
-	default y if RISCV_SMODE
+	default y if RISCV_SMODE || SPL_RISCV_SMODE
 	depends on SMP
 
 config XIP

+ 3 - 3
arch/riscv/cpu/ax25/Kconfig

@@ -4,8 +4,8 @@ config RISCV_NDS
 	imply CPU
 	imply CPU_RISCV
 	imply RISCV_TIMER
-	imply ANDES_PLIC if RISCV_MMODE
-	imply ANDES_PLMT if RISCV_MMODE
+	imply ANDES_PLIC if (RISCV_MMODE || SPL_RISCV_MMODE)
+	imply ANDES_PLMT if (RISCV_MMODE || SPL_RISCV_MMODE)
 	help
 	  Run U-Boot on AndeStar V5 platforms and use some specific features
 	  which are provided by Andes Technology AndeStar V5 families.
@@ -14,7 +14,7 @@ if RISCV_NDS
 
 config RISCV_NDS_CACHE
 	bool "AndeStar V5 families specific cache support"
-	depends on RISCV_MMODE
+	depends on RISCV_MMODE || SPL_RISCV_MMODE
 	help
 	  Provide Andes Technology AndeStar V5 families specific cache support.
 

+ 3 - 3
arch/riscv/cpu/cpu.c

@@ -46,13 +46,13 @@ static inline bool supports_extension(char ext)
 
 	return false;
 #else  /* !CONFIG_CPU */
-#ifdef CONFIG_RISCV_MMODE
+#if CONFIG_IS_ENABLED(RISCV_MMODE)
 	return csr_read(CSR_MISA) & (1 << (ext - 'a'));
-#else  /* !CONFIG_RISCV_MMODE */
+#else  /* !CONFIG_IS_ENABLED(RISCV_MMODE) */
 #warning "There is no way to determine the available extensions in S-mode."
 #warning "Please convert your board to use the RISC-V CPU driver."
 	return false;
-#endif /* CONFIG_RISCV_MMODE */
+#endif /* CONFIG_IS_ENABLED(RISCV_MMODE) */
 #endif /* CONFIG_CPU */
 }
 

+ 1 - 1
arch/riscv/cpu/generic/Kconfig

@@ -8,5 +8,5 @@ config GENERIC_RISCV
 	imply CPU
 	imply CPU_RISCV
 	imply RISCV_TIMER
-	imply SIFIVE_CLINT if RISCV_MMODE
+	imply SIFIVE_CLINT if (RISCV_MMODE || SPL_RISCV_MMODE)
 	imply CMD_CPU

+ 3 - 3
arch/riscv/cpu/start.S

@@ -39,7 +39,7 @@ secondary_harts_relocation_error:
 .section .text
 .globl _start
 _start:
-#ifdef CONFIG_RISCV_MMODE
+#if CONFIG_IS_ENABLED(RISCV_MMODE)
 	csrr	a0, CSR_MHARTID
 #endif
 
@@ -62,7 +62,7 @@ _start:
 
 #ifdef CONFIG_SMP
 	/* set xSIE bit to receive IPIs */
-#ifdef CONFIG_RISCV_MMODE
+#if CONFIG_IS_ENABLED(RISCV_MMODE)
 	li	t0, MIE_MSIE
 #else
 	li	t0, SIE_SSIE
@@ -344,7 +344,7 @@ secondary_hart_loop:
 
 #ifdef CONFIG_SMP
 	csrr	t0, MODE_PREFIX(ip)
-#ifdef CONFIG_RISCV_MMODE
+#if CONFIG_IS_ENABLED(RISCV_MMODE)
 	andi	t0, t0, MIE_MSIE
 #else
 	andi	t0, t0, SIE_SSIE

+ 1 - 1
arch/riscv/include/asm/encoding.h

@@ -9,7 +9,7 @@
 
 #include <asm/csr.h>
 
-#ifdef CONFIG_RISCV_SMODE
+#if CONFIG_IS_ENABLED(RISCV_SMODE)
 #define MODE_PREFIX(__suffix)	s##__suffix
 #else
 #define MODE_PREFIX(__suffix)	m##__suffix

+ 5 - 2
arch/riscv/lib/Makefile

@@ -10,13 +10,16 @@ obj-$(CONFIG_CMD_BOOTM) += bootm.o
 obj-$(CONFIG_CMD_BOOTI) += bootm.o image.o
 obj-$(CONFIG_CMD_GO) += boot.o
 obj-y	+= cache.o
-obj-$(CONFIG_RISCV_RDTIME) += rdtime.o
+ifeq ($(CONFIG_$(SPL_)RISCV_MMODE),y)
 obj-$(CONFIG_SIFIVE_CLINT) += sifive_clint.o
 obj-$(CONFIG_ANDES_PLIC) += andes_plic.o
 obj-$(CONFIG_ANDES_PLMT) += andes_plmt.o
+else
+obj-$(CONFIG_RISCV_RDTIME) += rdtime.o
+obj-$(CONFIG_SBI_IPI) += sbi_ipi.o
+endif
 obj-y	+= interrupts.o
 obj-y	+= reset.o
-obj-$(CONFIG_SBI_IPI) += sbi_ipi.o
 obj-y   += setjmp.o
 obj-$(CONFIG_SMP) += smp.o