arch/{arm,ppc64,riscv}: Remove cpu_info

The structure and function are not currently used or implemented. x86 is
the only arch that currently implements it. It is currently used for
COOP_MULTITASKING and mp_init.

Keeping around the unused definitions leads to confusion.

BUG=b:179699789
TEST=none

Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: I0775ef03168f7f9c41b1b05cb8f12724d0458ba5
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56572
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>

5 files changed, 0 insertions, 44 deletions

diff --git a/src/arch/arm/Makefile.inc b/src/arch/arm/Makefile.inc
index 63367bb2c0..b18b137252 100644
--- a/src/arch/arm/Makefile.inc
+++ b/src/arch/arm/Makefile.inc
@@ -106,7 +106,6 @@ ifeq ($(CONFIG_ARCH_RAMSTAGE_ARM),y)
 
 ramstage-y += stages.c
 ramstage-y += div0.c
-ramstage-$(CONFIG_COOP_MULTITASKING) += cpu.c
 ramstage-y += eabi_compat.c
 ramstage-y += boot.c
 ramstage-y += tables.c
diff --git a/src/arch/arm/cpu.c b/src/arch/arm/cpu.c
deleted file mode 100644
index 75816d3fc0..0000000000
--- a/src/arch/arm/cpu.c
+++ /dev/null
@@ -1,19 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-
-#include <arch/cpu.h>
-#include <commonlib/helpers.h>
-
-/* Return the CPU struct which is at the high memory address of the stack.
- */
-struct cpu_info *cpu_info(void)
-{
-#error "This is BROKEN! ARM stacks are currently not guaranteed to be " \
-	"STACK_SIZE-aligned in any way. If you ever plan to revive this " \
-	"feature, make sure you add the proper assertions " \
-	"(and maybe consider revising the whole thing to work closer to what " \
-	"arm64 is doing now)."
-	uintptr_t addr = ALIGN_UP((uintptr_t)__builtin_frame_address(0),
-		CONFIG_STACK_SIZE);
-	addr -= sizeof(struct cpu_info);
-	return (void *)addr;
-}
diff --git a/src/arch/arm/include/armv7/arch/cpu.h b/src/arch/arm/include/armv7/arch/cpu.h
index af79344836..3f1f1ae811 100644
--- a/src/arch/arm/include/armv7/arch/cpu.h
+++ b/src/arch/arm/include/armv7/arch/cpu.h
@@ -75,5 +75,4 @@ static inline void set_system_mode(void)
 	asm volatile("msr cpsr_c, %0" :: "r"(0x1f | 0xc0));
 }
 
-struct cpu_info *cpu_info(void);
 #endif /* __ARCH_CPU_H__ */
diff --git a/src/arch/ppc64/include/arch/cpu.h b/src/arch/ppc64/include/arch/cpu.h
index d41b94a450..5e5ba30ab5 100644
--- a/src/arch/ppc64/include/arch/cpu.h
+++ b/src/arch/ppc64/include/arch/cpu.h
@@ -12,22 +12,10 @@ struct cpu_driver {
 	const struct cpu_device_id *id_table;
 };
 
-struct thread;
-
-struct cpu_info {
-	struct device *cpu;
-	unsigned long index;
-#if CONFIG(COOP_MULTITASKING)
-	struct thread *thread;
-#endif
-};
-
 struct cpuinfo_ppc64 {
 	uint8_t    ppc64;            /* CPU family */
 	uint8_t    ppc64_vendor;     /* CPU vendor */
 	uint8_t    ppc64_model;
 };
 
-struct cpu_info *cpu_info(void);
-
 #endif /* __ARCH_CPU_H__ */
diff --git a/src/arch/riscv/include/arch/cpu.h b/src/arch/riscv/include/arch/cpu.h
index d623e84241..7cf94615a6 100644
--- a/src/arch/riscv/include/arch/cpu.h
+++ b/src/arch/riscv/include/arch/cpu.h
@@ -13,16 +13,6 @@ struct cpu_driver {
 	const struct cpu_device_id *id_table;
 };
 
-struct thread;
-
-struct cpu_info {
-	struct device *cpu;
-	unsigned long index;
-#if CONFIG(COOP_MULTITASKING)
-	struct thread *thread;
-#endif
-};
-
 struct cpuinfo_riscv {
 	uint8_t    riscv;            /* CPU family */
 	uint8_t    riscv_vendor;     /* CPU vendor */
@@ -40,5 +30,4 @@ static inline int machine_xlen(void)
 	return (1 << mxl) * 16;
 }
 
-struct cpu_info *cpu_info(void);
 #endif /* __ARCH_CPU_H__ */