ARCv2: Support for ARCv2 ISA and HS38x cores
The notable features are:
- SMP configurations of upto 4 cores with coherency
- Optional L2 Cache and IO-Coherency
- Revised Interrupt Architecture (multiple priorites, reg banks,
auto stack switch, auto regfile save/restore)
- MMUv4 (PIPT dcache, Huge Pages)
- Instructions for
* 64bit load/store: LDD, STD
* Hardware assisted divide/remainder: DIV, REM
* Function prologue/epilogue: ENTER_S, LEAVE_S
* IRQ enable/disable: CLRI, SETI
* pop count: FFS, FLS
* SETcc, BMSKN, XBFU...
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index 1eeefd9..f723988 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -88,11 +88,31 @@
endmenu
+choice
+ prompt "ARC Instruction Set"
+ default ISA_ARCOMPACT
+
+config ISA_ARCOMPACT
+ bool "ARCompact ISA"
+ help
+ The original ARC ISA of ARC600/700 cores
+
+### For bisectability, disable ARCv2 support until we have all the bits in place
+#config ISA_ARCV2
+# bool "ARC ISA v2"
+# help
+# ISA for the Next Generation ARC-HS cores
+
+endchoice
+
menu "ARC CPU Configuration"
choice
prompt "ARC Core"
- default ARC_CPU_770
+ default ARC_CPU_770 if ISA_ARCOMPACT
+ default ARC_CPU_HS if ISA_ARCV2
+
+if ISA_ARCOMPACT
config ARC_CPU_750D
bool "ARC750D"
@@ -110,6 +130,27 @@
-Caches: New Prog Model, Region Flush
-Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
+endif #ISA_ARCOMPACT
+
+config ARC_CPU_HS
+ bool "ARC-HS"
+ depends on ISA_ARCV2
+ help
+ Support for ARC HS38x Cores based on ARCv2 ISA
+ The notable features are:
+ - SMP configurations of upto 4 core with coherency
+ - Optional L2 Cache and IO-Coherency
+ - Revised Interrupt Architecture (multiple priorites, reg banks,
+ auto stack switch, auto regfile save/restore)
+ - MMUv4 (PIPT dcache, Huge Pages)
+ - Instructions for
+ * 64bit load/store: LDD, STD
+ * Hardware assisted divide/remainder: DIV, REM
+ * Function prologue/epilogue: ENTER_S, LEAVE_S
+ * IRQ enable/disable: CLRI, SETI
+ * pop count: FFS, FLS
+ * SETcc, BMSKN, XBFU...
+
endchoice
config CPU_BIG_ENDIAN
@@ -134,7 +175,7 @@
config ARC_HAS_REENTRANT_IRQ_LV2
def_bool n
-endif
+endif #SMP
config NR_CPUS
int "Maximum number of CPUs (2-4096)"
@@ -223,7 +264,7 @@
Multipler. Otherwise software multipy lib is used
choice
- prompt "ARC700 MMU Version"
+ prompt "MMU Version"
default ARC_MMU_V3 if ARC_CPU_770
default ARC_MMU_V2 if ARC_CPU_750D
@@ -268,6 +309,8 @@
endchoice
+if ISA_ARCOMPACT
+
config ARC_COMPACT_IRQ_LEVELS
bool "ARCompact IRQ Priorities: High(2)/Low(1)"
default n
@@ -287,7 +330,7 @@
config ARC_IRQ6_LV2
bool
-endif
+endif #ARC_COMPACT_IRQ_LEVELS
config ARC_FPU_SAVE_RESTORE
bool "Enable FPU state persistence across context switch"
@@ -300,18 +343,43 @@
based on actual usage of FPU by a task. Thus our implemn does
this for all tasks in system.
+endif #ISA_ARCOMPACT
+
config ARC_CANT_LLSC
def_bool n
config ARC_HAS_LLSC
bool "Insn: LLOCK/SCOND (efficient atomic ops)"
default y
- depends on ARC_CPU_770 && !ARC_CANT_LLSC
+ depends on !ARC_CPU_750D && !ARC_CANT_LLSC
config ARC_HAS_SWAPE
bool "Insn: SWAPE (endian-swap)"
default y
+if ISA_ARCV2
+
+config ARC_HAS_LL64
+ bool "Insn: 64bit LDD/STD"
+ help
+ Enable gcc to generate 64-bit load/store instructions
+ ISA mandates even/odd registers to allow encoding of two
+ dest operands with 2 possible source operands.
+ default y
+
+config ARC_NUMBER_OF_INTERRUPTS
+ int "Number of interrupts"
+ range 8 240
+ default 32
+ help
+ This defines the number of interrupts on the ARCv2HS core.
+ It affects the size of vector table.
+ The initial 8 IRQs are fixed (Timer, ICI etc) and although configurable
+ in hardware, it keep things simple for Linux to assume they are always
+ present.
+
+endif # ISA_ARCV2
+
endmenu # "ARC CPU Configuration"
config LINUX_LINK_BASE
@@ -337,8 +405,10 @@
config ARC_EMUL_UNALIGNED
bool "Emulate unaligned memory access (userspace only)"
+ default N
select SYSCTL_ARCH_UNALIGN_NO_WARN
select SYSCTL_ARCH_UNALIGN_ALLOW
+ depends on ISA_ARCOMPACT
help
This enables misaligned 16 & 32 bit memory access from user space.
Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
diff --git a/arch/arc/Makefile b/arch/arc/Makefile
index 86c71b2..bf68dc5 100644
--- a/arch/arc/Makefile
+++ b/arch/arc/Makefile
@@ -14,7 +14,9 @@
KBUILD_DEFCONFIG := nsim_700_defconfig
-cflags-y += -mA7 -fno-common -pipe -fno-builtin -D__linux__
+cflags-y += -fno-common -pipe -fno-builtin -D__linux__
+cflags-${CONFIG_ISA_ARCOMPACT} += -mA7
+cflags-${CONFIG_ISA_ARCV2} += -mcpu=archs
ifdef CONFIG_ARC_CURR_IN_REG
# For a global register defintion, make sure it gets passed to every file
@@ -34,6 +36,10 @@
cflags-$(CONFIG_ARC_HAS_LLSC) += -mlock
cflags-$(CONFIG_ARC_HAS_SWAPE) += -mswape
+ifndef CONFIG_ARC_HAS_LL64
+cflags-y += -mno-ll64
+endif
+
cflags-$(CONFIG_ARC_DW2_UNWIND) += -fasynchronous-unwind-tables
# By default gcc 4.8 generates dwarf4 which kernel unwinder can't grok
diff --git a/arch/arc/include/asm/arcregs.h b/arch/arc/include/asm/arcregs.h
index 6496465..373bb41 100644
--- a/arch/arc/include/asm/arcregs.h
+++ b/arch/arc/include/asm/arcregs.h
@@ -16,6 +16,7 @@
#define ARC_REG_PERIBASE_BCR 0x69
#define ARC_REG_FP_BCR 0x6B /* ARCompact: Single-Precision FPU */
#define ARC_REG_DPFP_BCR 0x6C /* ARCompact: Dbl Precision FPU */
+#define ARC_REG_FP_V2_BCR 0xc8 /* ARCv2 FPU */
#define ARC_REG_DCCM_BCR 0x74 /* DCCM Present + SZ */
#define ARC_REG_TIMERS_BCR 0x75
#define ARC_REG_AP_BCR 0x76
@@ -52,6 +53,7 @@
* [15: 8] = Exception Cause Code
* [ 7: 0] = Exception Parameters (for certain types only)
*/
+#ifdef CONFIG_ISA_ARCOMPACT
#define ECR_V_MEM_ERR 0x01
#define ECR_V_INSN_ERR 0x02
#define ECR_V_MACH_CHK 0x20
@@ -59,6 +61,15 @@
#define ECR_V_DTLB_MISS 0x22
#define ECR_V_PROTV 0x23
#define ECR_V_TRAP 0x25
+#else
+#define ECR_V_MEM_ERR 0x01
+#define ECR_V_INSN_ERR 0x02
+#define ECR_V_MACH_CHK 0x03
+#define ECR_V_ITLB_MISS 0x04
+#define ECR_V_DTLB_MISS 0x05
+#define ECR_V_PROTV 0x06
+#define ECR_V_TRAP 0x09
+#endif
/* DTLB Miss and Protection Violation Cause Codes */
@@ -202,9 +213,11 @@
struct bcr_isa {
#ifdef CONFIG_CPU_BIG_ENDIAN
- unsigned int pad1:23, atomic1:1, ver:8;
+ unsigned int div_rem:4, pad2:4, ldd:1, unalign:1, atomic:1, be:1,
+ pad1:11, atomic1:1, ver:8;
#else
- unsigned int ver:8, atomic1:1, pad1:23;
+ unsigned int ver:8, atomic1:1, pad1:11, be:1, atomic:1, unalign:1,
+ ldd:1, pad2:4, div_rem:4;
#endif
};
@@ -267,11 +280,19 @@
#endif
};
+struct bcr_fp_arcv2 {
+#ifdef CONFIG_CPU_BIG_ENDIAN
+ unsigned int pad2:15, dp:1, pad1:7, sp:1, ver:8;
+#else
+ unsigned int ver:8, sp:1, pad1:7, dp:1, pad2:15;
+#endif
+};
+
struct bcr_timer {
#ifdef CONFIG_CPU_BIG_ENDIAN
- unsigned int pad2:15, rtsc:1, pad1:6, t1:1, t0:1, ver:8;
+ unsigned int pad2:15, rtsc:1, pad1:5, rtc:1, t1:1, t0:1, ver:8;
#else
- unsigned int ver:8, t0:1, t1:1, pad1:6, rtsc:1, pad2:15;
+ unsigned int ver:8, t0:1, t1:1, rtc:1, pad1:5, rtsc:1, pad2:15;
#endif
};
@@ -283,6 +304,14 @@
#endif
};
+struct bcr_bpu_arcv2 {
+#ifdef CONFIG_CPU_BIG_ENDIAN
+ unsigned int pad:6, fbe:2, tqe:2, ts:4, ft:1, rse:2, pte:3, bce:3, ver:8;
+#else
+ unsigned int ver:8, bce:3, pte:3, rse:2, ft:1, ts:4, tqe:2, fbe:2, pad:6;
+#endif
+};
+
struct bcr_generic {
#ifdef CONFIG_CPU_BIG_ENDIAN
unsigned int pad:24, ver:8;
@@ -334,6 +363,22 @@
extern struct cpuinfo_arc cpuinfo_arc700[];
+static inline int is_isa_arcv2(void)
+{
+ return IS_ENABLED(CONFIG_ISA_ARCV2);
+}
+
+static inline int is_isa_arcompact(void)
+{
+ return IS_ENABLED(CONFIG_ISA_ARCOMPACT);
+}
+
+#if defined(CONFIG_ISA_ARCOMPACT) && !defined(_CPU_DEFAULT_A7)
+#error "Toolchain not configured for ARCompact builds"
+#elif defined(CONFIG_ISA_ARCV2) && !defined(_CPU_DEFAULT_HS)
+#error "Toolchain not configured for ARCv2 builds"
+#endif
+
#endif /* __ASEMBLY__ */
#endif /* _ASM_ARC_ARCREGS_H */
diff --git a/arch/arc/include/asm/bitops.h b/arch/arc/include/asm/bitops.h
index 4051e95..829a8a2 100644
--- a/arch/arc/include/asm/bitops.h
+++ b/arch/arc/include/asm/bitops.h
@@ -402,6 +402,8 @@
return ((mask & *addr) != 0);
}
+#ifdef CONFIG_ISA_ARCOMPACT
+
/*
* Count the number of zeros, starting from MSB
* Helper for fls( ) friends
@@ -494,6 +496,75 @@
return ffs(word) - 1;
}
+#else /* CONFIG_ISA_ARCV2 */
+
+/*
+ * fls = Find Last Set in word
+ * @result: [1-32]
+ * fls(1) = 1, fls(0x80000000) = 32, fls(0) = 0
+ */
+static inline __attribute__ ((const)) int fls(unsigned long x)
+{
+ int n;
+
+ asm volatile(
+ " fls.f %0, %1 \n" /* 0:31; 0(Z) if src 0 */
+ " add.nz %0, %0, 1 \n" /* 0:31 -> 1:32 */
+ : "=r"(n) /* Early clobber not needed */
+ : "r"(x)
+ : "cc");
+
+ return n;
+}
+
+/*
+ * __fls: Similar to fls, but zero based (0-31). Also 0 if no bit set
+ */
+static inline __attribute__ ((const)) int __fls(unsigned long x)
+{
+ /* FLS insn has exactly same semantics as the API */
+ return __builtin_arc_fls(x);
+}
+
+/*
+ * ffs = Find First Set in word (LSB to MSB)
+ * @result: [1-32], 0 if all 0's
+ */
+static inline __attribute__ ((const)) int ffs(unsigned long x)
+{
+ int n;
+
+ asm volatile(
+ " ffs.f %0, %1 \n" /* 0:31; 31(Z) if src 0 */
+ " add.nz %0, %0, 1 \n" /* 0:31 -> 1:32 */
+ " mov.z %0, 0 \n" /* 31(Z)-> 0 */
+ : "=r"(n) /* Early clobber not needed */
+ : "r"(x)
+ : "cc");
+
+ return n;
+}
+
+/*
+ * __ffs: Similar to ffs, but zero based (0-31)
+ */
+static inline __attribute__ ((const)) int __ffs(unsigned long x)
+{
+ int n;
+
+ asm volatile(
+ " ffs.f %0, %1 \n" /* 0:31; 31(Z) if src 0 */
+ " mov.z %0, 0 \n" /* 31(Z)-> 0 */
+ : "=r"(n)
+ : "r"(x)
+ : "cc");
+
+ return n;
+
+}
+
+#endif /* CONFIG_ISA_ARCOMPACT */
+
/*
* ffz = Find First Zero in word.
* @return:[0-31], 32 if all 1's
diff --git a/arch/arc/include/asm/elf.h b/arch/arc/include/asm/elf.h
index a262828..51a99e2 100644
--- a/arch/arc/include/asm/elf.h
+++ b/arch/arc/include/asm/elf.h
@@ -15,6 +15,11 @@
/* These ELF defines belong to uapi but libc elf.h already defines them */
#define EM_ARCOMPACT 93
+#define EM_ARCV2 195 /* ARCv2 Cores */
+
+#define EM_ARC_INUSE (IS_ENABLED(CONFIG_ISA_ARCOMPACT) ? \
+ EM_ARCOMPACT : EM_ARCV2)
+
/* ARC Relocations (kernel Modules only) */
#define R_ARC_32 0x4
#define R_ARC_32_ME 0x1B
diff --git a/arch/arc/include/asm/entry-arcv2.h b/arch/arc/include/asm/entry-arcv2.h
new file mode 100644
index 0000000..b5ff87e
--- /dev/null
+++ b/arch/arc/include/asm/entry-arcv2.h
@@ -0,0 +1,190 @@
+
+#ifndef __ASM_ARC_ENTRY_ARCV2_H
+#define __ASM_ARC_ENTRY_ARCV2_H
+
+#include <asm/asm-offsets.h>
+#include <asm/irqflags-arcv2.h>
+#include <asm/thread_info.h> /* For THREAD_SIZE */
+
+/*------------------------------------------------------------------------*/
+.macro INTERRUPT_PROLOGUE called_from
+
+ ; Before jumping to Interrupt Vector, hardware micro-ops did following:
+ ; 1. SP auto-switched to kernel mode stack
+ ; 2. STATUS32.Z flag set to U mode at time of interrupt (U:1, K:0)
+ ; 3. Auto saved: r0-r11, blink, LPE,LPS,LPC, JLI,LDI,EI, PC, STAT32
+ ;
+ ; Now manually save: r12, sp, fp, gp, r25
+
+ PUSH r12
+
+ ; Saving pt_regs->sp correctly requires some extra work due to the way
+ ; Auto stack switch works
+ ; - U mode: retrieve it from AUX_USER_SP
+ ; - K mode: add the offset from current SP where H/w starts auto push
+ ;
+ ; Utilize the fact that Z bit is set if Intr taken in U mode
+ mov.nz r9, sp
+ add.nz r9, r9, SZ_PT_REGS - PT_sp - 4
+ bnz 1f
+
+ lr r9, [AUX_USER_SP]
+1:
+ PUSH r9 ; SP
+
+ PUSH fp
+ PUSH gp
+
+#ifdef CONFIG_ARC_CURR_IN_REG
+ PUSH r25 ; user_r25
+ GET_CURR_TASK_ON_CPU r25
+#else
+ sub sp, sp, 4
+#endif
+
+.ifnc \called_from, exception
+ sub sp, sp, 12 ; BTA/ECR/orig_r0 placeholder per pt_regs
+.endif
+
+.endm
+
+/*------------------------------------------------------------------------*/
+.macro INTERRUPT_EPILOGUE called_from
+
+.ifnc \called_from, exception
+ add sp, sp, 12 ; skip BTA/ECR/orig_r0 placeholderss
+.endif
+
+#ifdef CONFIG_ARC_CURR_IN_REG
+ POP r25
+#else
+ add sp, sp, 4
+#endif
+
+ POP gp
+ POP fp
+
+ ; Don't touch AUX_USER_SP if returning to K mode (Z bit set)
+ ; (Z bit set on K mode is inverse of INTERRUPT_PROLOGUE)
+ add.z sp, sp, 4
+ bz 1f
+
+ POPAX AUX_USER_SP
+1:
+ POP r12
+
+.endm
+
+/*------------------------------------------------------------------------*/
+.macro EXCEPTION_PROLOGUE
+
+ ; Before jumping to Exception Vector, hardware micro-ops did following:
+ ; 1. SP auto-switched to kernel mode stack
+ ; 2. STATUS32.Z flag set to U mode at time of interrupt (U:1,K:0)
+ ;
+ ; Now manually save the complete reg file
+
+ PUSH r9 ; freeup a register: slot of erstatus
+
+ PUSHAX eret
+ sub sp, sp, 12 ; skip JLI, LDI, EI
+ PUSH lp_count
+ PUSHAX lp_start
+ PUSHAX lp_end
+ PUSH blink
+
+ PUSH r11
+ PUSH r10
+
+ ld.as r9, [sp, 10] ; load stashed r9 (status32 stack slot)
+ lr r10, [erstatus]
+ st.as r10, [sp, 10] ; save status32 at it's right stack slot
+
+ PUSH r9
+ PUSH r8
+ PUSH r7
+ PUSH r6
+ PUSH r5
+ PUSH r4
+ PUSH r3
+ PUSH r2
+ PUSH r1
+ PUSH r0
+
+ ; -- for interrupts, regs above are auto-saved by h/w in that order --
+ ; Now do what ISR prologue does (manually save r12, sp, fp, gp, r25)
+ ;
+ ; Set Z flag if this was from U mode (expected by INTERRUPT_PROLOGUE)
+ ; Although H/w exception micro-ops do set Z flag for U mode (just like
+ ; for interrupts), it could get clobbered in case we soft land here from
+ ; a TLB Miss exception handler (tlbex.S)
+
+ and r10, r10, STATUS_U_MASK
+ xor.f 0, r10, STATUS_U_MASK
+
+ INTERRUPT_PROLOGUE exception
+
+ PUSHAX erbta
+ PUSHAX ecr ; r9 contains ECR, expected by EV_Trap
+
+ PUSH r0 ; orig_r0
+.endm
+
+/*------------------------------------------------------------------------*/
+.macro EXCEPTION_EPILOGUE
+
+ ; Assumes r0 has PT_status32
+ btst r0, STATUS_U_BIT ; Z flag set if K, used in INTERRUPT_EPILOGUE
+
+ add sp, sp, 8 ; orig_r0/ECR don't need restoring
+ POPAX erbta
+
+ INTERRUPT_EPILOGUE exception
+
+ POP r0
+ POP r1
+ POP r2
+ POP r3
+ POP r4
+ POP r5
+ POP r6
+ POP r7
+ POP r8
+ POP r9
+ POP r10
+ POP r11
+
+ POP blink
+ POPAX lp_end
+ POPAX lp_start
+
+ POP r9
+ mov lp_count, r9
+
+ add sp, sp, 12 ; skip JLI, LDI, EI
+ POPAX eret
+ POPAX erstatus
+
+ ld.as r9, [sp, -12] ; reload r9 which got clobbered
+.endm
+
+.macro FAKE_RET_FROM_EXCPN
+ lr r9, [status32]
+ bic r9, r9, (STATUS_U_MASK|STATUS_DE_MASK|STATUS_AE_MASK)
+ or r9, r9, (STATUS_L_MASK|STATUS_IE_MASK)
+ kflag r9
+.endm
+
+/* Get thread_info of "current" tsk */
+.macro GET_CURR_THR_INFO_FROM_SP reg
+ bmskn \reg, sp, THREAD_SHIFT - 1
+.endm
+
+/* Get CPU-ID of this core */
+.macro GET_CPU_ID reg
+ lr \reg, [identity]
+ xbfu \reg, \reg, 0xE8 /* 00111 01000 */
+ /* M = 8-1 N = 8 */
+.endm
+
+#endif
diff --git a/arch/arc/include/asm/entry.h b/arch/arc/include/asm/entry.h
index f61032c..29d0ab6 100644
--- a/arch/arc/include/asm/entry.h
+++ b/arch/arc/include/asm/entry.h
@@ -16,7 +16,11 @@
#include <asm/processor.h> /* For VMALLOC_START */
#include <asm/mmu.h>
+#ifdef CONFIG_ISA_ARCOMPACT
#include <asm/entry-compact.h> /* ISA specific bits */
+#else
+#include <asm/entry-arcv2.h>
+#endif
/* Note on the LD/ST addr modes with addr reg wback
*
diff --git a/arch/arc/include/asm/irq.h b/arch/arc/include/asm/irq.h
index f38652f..49014f0 100644
--- a/arch/arc/include/asm/irq.h
+++ b/arch/arc/include/asm/irq.h
@@ -13,8 +13,13 @@
#define NR_IRQS 128 /* allow some CPU external IRQ handling */
/* Platform Independent IRQs */
+#ifdef CONFIG_ISA_ARCOMPACT
#define TIMER0_IRQ 3
#define TIMER1_IRQ 4
+#else
+#define TIMER0_IRQ 16
+#define TIMER1_IRQ 17
+#endif
#include <linux/interrupt.h>
#include <asm-generic/irq.h>
diff --git a/arch/arc/include/asm/irqflags-arcv2.h b/arch/arc/include/asm/irqflags-arcv2.h
index c946c56..1eb41b0 100644
--- a/arch/arc/include/asm/irqflags-arcv2.h
+++ b/arch/arc/include/asm/irqflags-arcv2.h
@@ -27,6 +27,9 @@
#define AUX_IRQ_SELECT 0x40b
#define AUX_IRQ_ENABLE 0x40c
+/* Was Intr taken in User Mode */
+#define AUX_IRQ_ACT_BIT_U 31
+
/* 0 is highest level, but taken by FIRQs, if present in design */
#define ARCV2_IRQ_DEF_PRIO 0
diff --git a/arch/arc/include/asm/irqflags-compact.h b/arch/arc/include/asm/irqflags-compact.h
index 18f3634..aa80557 100644
--- a/arch/arc/include/asm/irqflags-compact.h
+++ b/arch/arc/include/asm/irqflags-compact.h
@@ -39,6 +39,8 @@
#define AUX_ITRIGGER 0x40d
#define AUX_IPULSE 0x415
+#define ISA_INIT_STATUS_BITS STATUS_IE_MASK
+
#ifndef __ASSEMBLY__
/******************************************************************
diff --git a/arch/arc/include/asm/irqflags.h b/arch/arc/include/asm/irqflags.h
index 3339726..59bc6a6 100644
--- a/arch/arc/include/asm/irqflags.h
+++ b/arch/arc/include/asm/irqflags.h
@@ -10,6 +10,10 @@
#ifndef __ASM_ARC_IRQFLAGS_H
#define __ASM_ARC_IRQFLAGS_H
+#ifdef CONFIG_ISA_ARCOMPACT
#include <asm/irqflags-compact.h>
+#else
+#include <asm/irqflags-arcv2.h>
+#endif
#endif
diff --git a/arch/arc/include/asm/ptrace.h b/arch/arc/include/asm/ptrace.h
index 1bfeec2..9175597 100644
--- a/arch/arc/include/asm/ptrace.h
+++ b/arch/arc/include/asm/ptrace.h
@@ -16,6 +16,7 @@
/* THE pt_regs: Defines how regs are saved during entry into kernel */
+#ifdef CONFIG_ISA_ARCOMPACT
struct pt_regs {
/* Real registers */
@@ -56,6 +57,48 @@
long user_r25;
};
+#else
+
+struct pt_regs {
+
+ long orig_r0;
+
+ union {
+ struct {
+#ifdef CONFIG_CPU_BIG_ENDIAN
+ unsigned long state:8, ecr_vec:8,
+ ecr_cause:8, ecr_param:8;
+#else
+ unsigned long ecr_param:8, ecr_cause:8,
+ ecr_vec:8, state:8;
+#endif
+ };
+ unsigned long event;
+ };
+
+ long bta; /* bta_l1, bta_l2, erbta */
+
+ long user_r25;
+
+ long r26; /* gp */
+ long fp;
+ long sp; /* user/kernel sp depending on where we came from */
+
+ long r12;
+
+ /*------- Below list auto saved by h/w -----------*/
+ long r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11;
+
+ long blink;
+ long lp_end, lp_start, lp_count;
+
+ long ei, ldi, jli;
+
+ long ret;
+ long status32;
+};
+
+#endif
/* Callee saved registers - need to be saved only when you are scheduled out */
diff --git a/arch/arc/include/asm/thread_info.h b/arch/arc/include/asm/thread_info.h
index aca0d5a..3af6745 100644
--- a/arch/arc/include/asm/thread_info.h
+++ b/arch/arc/include/asm/thread_info.h
@@ -25,6 +25,7 @@
#endif
#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
+#define THREAD_SHIFT (PAGE_SHIFT << THREAD_SIZE_ORDER)
#ifndef __ASSEMBLY__
diff --git a/arch/arc/kernel/Makefile b/arch/arc/kernel/Makefile
index cc929c0..0be7ba0 100644
--- a/arch/arc/kernel/Makefile
+++ b/arch/arc/kernel/Makefile
@@ -10,7 +10,8 @@
obj-y := arcksyms.o setup.o irq.o time.o reset.o ptrace.o process.o devtree.o
obj-y += signal.o traps.o sys.o troubleshoot.o stacktrace.o disasm.o clk.o
-obj-y += entry-compact.o intc-compact.o
+obj-$(CONFIG_ISA_ARCOMPACT) += entry-compact.o intc-compact.o
+obj-$(CONFIG_ISA_ARCV2) += entry-arcv2.o intc-arcv2.o
obj-$(CONFIG_MODULES) += arcksyms.o module.o
obj-$(CONFIG_SMP) += smp.o
diff --git a/arch/arc/kernel/entry-arcv2.S b/arch/arc/kernel/entry-arcv2.S
new file mode 100644
index 0000000..c59a396
--- /dev/null
+++ b/arch/arc/kernel/entry-arcv2.S
@@ -0,0 +1,189 @@
+/*
+ * ARCv2 ISA based core Low Level Intr/Traps/Exceptions(non-TLB) Handling
+ *
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/linkage.h> /* ARC_{EXTRY,EXIT} */
+#include <asm/entry.h> /* SAVE_ALL_{INT1,INT2,TRAP...} */
+#include <asm/errno.h>
+#include <asm/arcregs.h>
+#include <asm/irqflags.h>
+
+ .cpu HS
+
+#define VECTOR .word
+
+;############################ Vector Table #################################
+
+ .section .vector,"a",@progbits
+ .align 4
+
+# Initial 16 slots are Exception Vectors
+VECTOR stext ; Restart Vector (jump to entry point)
+VECTOR mem_service ; Mem exception
+VECTOR instr_service ; Instrn Error
+VECTOR EV_MachineCheck ; Fatal Machine check
+VECTOR EV_TLBMissI ; Intruction TLB miss
+VECTOR EV_TLBMissD ; Data TLB miss
+VECTOR EV_TLBProtV ; Protection Violation
+VECTOR EV_PrivilegeV ; Privilege Violation
+VECTOR EV_SWI ; Software Breakpoint
+VECTOR EV_Trap ; Trap exception
+VECTOR EV_Extension ; Extn Instruction Exception
+VECTOR EV_DivZero ; Divide by Zero
+VECTOR EV_DCError ; Data Cache Error
+VECTOR EV_Misaligned ; Misaligned Data Access
+VECTOR reserved ; Reserved slots
+VECTOR reserved ; Reserved slots
+
+# Begin Interrupt Vectors
+VECTOR handle_interrupt ; (16) Timer0
+VECTOR handle_interrupt ; unused (Timer1)
+VECTOR handle_interrupt ; unused (WDT)
+VECTOR handle_interrupt ; (19) ICI (inter core interrupt)
+VECTOR handle_interrupt
+VECTOR handle_interrupt
+VECTOR handle_interrupt
+VECTOR handle_interrupt ; (23) End of fixed IRQs
+
+.rept CONFIG_ARC_NUMBER_OF_INTERRUPTS - 8
+ VECTOR handle_interrupt
+.endr
+
+ .section .text, "ax",@progbits
+
+res_service: ; processor restart
+ flag 0x1 ; not implemented
+ nop
+ nop
+
+reserved: ; processor restart
+ rtie ; jump to processor initializations
+
+;##################### Interrupt Handling ##############################
+
+ENTRY(handle_interrupt)
+
+ INTERRUPT_PROLOGUE irq
+
+ clri ; To make status32.IE agree with CPU internal state
+
+ lr r0, [ICAUSE]
+
+ mov blink, ret_from_exception
+
+ b.d arch_do_IRQ
+ mov r1, sp
+
+END(handle_interrupt)
+
+;################### Non TLB Exception Handling #############################
+
+ENTRY(EV_SWI)
+ flag 1
+END(EV_SWI)
+
+ENTRY(EV_DivZero)
+ flag 1
+END(EV_DivZero)
+
+ENTRY(EV_DCError)
+ flag 1
+END(EV_DCError)
+
+ENTRY(EV_Misaligned)
+
+ EXCEPTION_PROLOGUE
+
+ lr r0, [efa] ; Faulting Data address
+ mov r1, sp
+
+ FAKE_RET_FROM_EXCPN
+
+ SAVE_CALLEE_SAVED_USER
+ mov r2, sp ; callee_regs
+
+ bl do_misaligned_access
+
+ ; TBD: optimize - do this only if a callee reg was involved
+ ; either a dst of emulated LD/ST or src with address-writeback
+ RESTORE_CALLEE_SAVED_USER
+
+ b ret_from_exception
+END(EV_Misaligned)
+
+; ---------------------------------------------
+; Protection Violation Exception Handler
+; ---------------------------------------------
+
+ENTRY(EV_TLBProtV)
+
+ EXCEPTION_PROLOGUE
+
+ lr r0, [efa] ; Faulting Data address
+ mov r1, sp ; pt_regs
+
+ FAKE_RET_FROM_EXCPN
+
+ mov blink, ret_from_exception
+ b do_page_fault
+
+END(EV_TLBProtV)
+
+; From Linux standpoint Slow Path I/D TLB Miss is same a ProtV as they
+; need to call do_page_fault().
+; ECR in pt_regs provides whether access was R/W/X
+
+.global call_do_page_fault
+.set call_do_page_fault, EV_TLBProtV
+
+;############# Common Handlers for ARCompact and ARCv2 ##############
+
+#include "entry.S"
+
+;############# Return from Intr/Excp/Trap (ARCv2 ISA Specifics) ##############
+;
+; Restore the saved sys context (common exit-path for EXCPN/IRQ/Trap)
+; IRQ shd definitely not happen between now and rtie
+; All 2 entry points to here already disable interrupts
+
+.Lrestore_regs:
+
+ ld r0, [sp, PT_status32] ; U/K mode at time of entry
+ lr r10, [AUX_IRQ_ACT]
+
+ bmsk r11, r10, 15 ; AUX_IRQ_ACT.ACTIVE
+ breq r11, 0, .Lexcept_ret ; No intr active, ret from Exception
+
+;####### Return from Intr #######
+
+debug_marker_l1:
+ ; Handle special case #1: (Entry via Exception, Return via IRQ)
+ ;
+ ; Exception in U mode, preempted in kernel, Intr taken (K mode), orig
+ ; task now returning to U mode (riding the Intr)
+ ; AUX_IRQ_ACTIVE won't have U bit set (since intr in K mode), hence SP
+ ; won't be switched to correct U mode value (from AUX_SP)
+ ; So force AUX_IRQ_ACT.U for such a case
+
+ btst r0, STATUS_U_BIT ; Z flag set if K (Z clear for U)
+ bset.nz r11, r11, AUX_IRQ_ACT_BIT_U ; NZ means U
+ sr r11, [AUX_IRQ_ACT]
+
+ INTERRUPT_EPILOGUE irq
+ rtie
+
+;####### Return from Exception / pure kernel mode #######
+
+.Lexcept_ret: ; Expects r0 has PT_status32
+
+debug_marker_syscall:
+ EXCEPTION_EPILOGUE
+ rtie
+
+END(ret_from_exception)
diff --git a/arch/arc/kernel/head.S b/arch/arc/kernel/head.S
index 64a92e0b1..812f95e 100644
--- a/arch/arc/kernel/head.S
+++ b/arch/arc/kernel/head.S
@@ -49,8 +49,6 @@
1:
.endm
- .cpu A7
-
.section .init.text, "ax",@progbits
.type stext, @function
.globl stext
diff --git a/arch/arc/kernel/process.c b/arch/arc/kernel/process.c
index b5426ba..5156043 100644
--- a/arch/arc/kernel/process.c
+++ b/arch/arc/kernel/process.c
@@ -44,7 +44,17 @@
void arch_cpu_idle(void)
{
/* sleep, but enable all interrupts before committing */
- __asm__("sleep 0x3");
+ if (is_isa_arcompact()) {
+ __asm__("sleep 0x3");
+ } else {
+ /* default irq priority (<=) which can interrupt the doze */
+ const int arg = 0x10 | ARCV2_IRQ_DEF_PRIO;
+
+ __asm__ __volatile__(
+ "sleep %0 \n"
+ :
+ :"r"(arg));
+ }
}
asmlinkage void ret_from_fork(void);
@@ -166,7 +176,7 @@
* [L] ZOL loop inhibited to begin with - cleared by a LP insn
* Interrupts enabled
*/
- regs->status32 = STATUS_U_MASK | STATUS_L_MASK | STATUS_IE_MASK;
+ regs->status32 = STATUS_U_MASK | STATUS_L_MASK | ISA_INIT_STATUS_BITS;
/* bogus seed values for debugging */
regs->lp_start = 0x10;
@@ -196,8 +206,11 @@
{
unsigned int eflags;
- if (x->e_machine != EM_ARCOMPACT)
+ if (x->e_machine != EM_ARC_INUSE) {
+ pr_err("ELF not built for %s ISA\n",
+ is_isa_arcompact() ? "ARCompact":"ARCv2");
return 0;
+ }
eflags = x->e_flags;
if ((eflags & EF_ARC_OSABI_MSK) < EF_ARC_OSABI_CURRENT) {
diff --git a/arch/arc/kernel/ptrace.c b/arch/arc/kernel/ptrace.c
index 4dd9e3a..4442204 100644
--- a/arch/arc/kernel/ptrace.c
+++ b/arch/arc/kernel/ptrace.c
@@ -200,7 +200,7 @@
static const struct user_regset_view user_arc_view = {
.name = UTS_MACHINE,
- .e_machine = EM_ARCOMPACT,
+ .e_machine = EM_ARC_INUSE,
.regsets = arc_regsets,
.n = ARRAY_SIZE(arc_regsets)
};
diff --git a/arch/arc/kernel/setup.c b/arch/arc/kernel/setup.c
index 96d4480..d6fe800 100644
--- a/arch/arc/kernel/setup.c
+++ b/arch/arc/kernel/setup.c
@@ -96,7 +96,7 @@
read_decode_mmu_bcr();
read_decode_cache_bcr();
- {
+ if (is_isa_arcompact()) {
struct bcr_fp_arcompact sp, dp;
struct bcr_bpu_arcompact bpu;
@@ -112,6 +112,19 @@
cpu->bpu.num_cache = 256 << (bpu.ent - 1);
cpu->bpu.num_pred = 256 << (bpu.ent - 1);
}
+ } else {
+ struct bcr_fp_arcv2 spdp;
+ struct bcr_bpu_arcv2 bpu;
+
+ READ_BCR(ARC_REG_FP_V2_BCR, spdp);
+ cpu->extn.fpu_sp = spdp.sp ? 1 : 0;
+ cpu->extn.fpu_dp = spdp.dp ? 1 : 0;
+
+ READ_BCR(ARC_REG_BPU_BCR, bpu);
+ cpu->bpu.ver = bpu.ver;
+ cpu->bpu.full = bpu.ft;
+ cpu->bpu.num_cache = 256 << bpu.bce;
+ cpu->bpu.num_pred = 2048 << bpu.pte;
}
READ_BCR(ARC_REG_AP_BCR, bcr);
@@ -131,6 +144,7 @@
{ {0x30, "ARC 700" }, 0x33},
{ {0x34, "ARC 700 R4.10"}, 0x34},
{ {0x35, "ARC 700 R4.11"}, 0x35},
+ { {0x50, "ARC HS38" }, 0x51},
{ {0x00, NULL } }
};
@@ -149,13 +163,17 @@
FIX_PTR(cpu);
- {
+ if (is_isa_arcompact()) {
isa_nm = "ARCompact";
be = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN);
atomic = cpu->isa.atomic1;
if (!cpu->isa.ver) /* ISA BCR absent, use Kconfig info */
atomic = IS_ENABLED(CONFIG_ARC_HAS_LLSC);
+ } else {
+ isa_nm = "ARCv2";
+ be = cpu->isa.be;
+ atomic = cpu->isa.atomic;
}
n += scnprintf(buf + n, len - n,
@@ -184,14 +202,31 @@
IS_AVAIL1(cpu->timers.t0, "Timer0 "),
IS_AVAIL1(cpu->timers.t1, "Timer1 "));
- n += i = scnprintf(buf + n, len - n, "%s%s",
- IS_AVAIL2(atomic, "atomic ", CONFIG_ARC_HAS_LLSC));
+ n += i = scnprintf(buf + n, len - n, "%s%s%s%s%s",
+ IS_AVAIL2(atomic, "atomic ", CONFIG_ARC_HAS_LLSC),
+ IS_AVAIL2(cpu->isa.ldd, "ll64 ", CONFIG_ARC_HAS_LL64),
+ IS_AVAIL1(cpu->isa.unalign, "unalign (not used)"));
if (i)
n += scnprintf(buf + n, len - n, "\n\t\t: ");
+ if (cpu->extn_mpy.ver) {
+ if (cpu->extn_mpy.ver <= 0x2) { /* ARCompact */
+ n += scnprintf(buf + n, len - n, "mpy ");
+ } else {
+ int opt = 2; /* stock MPY/MPYH */
+
+ if (cpu->extn_mpy.dsp) /* OPT 7-9 */
+ opt = cpu->extn_mpy.dsp + 6;
+
+ n += scnprintf(buf + n, len - n, "mpy[opt %d] ", opt);
+ }
+ n += scnprintf(buf + n, len - n, "%s",
+ IS_USED(CONFIG_ARC_HAS_HW_MPY));
+ }
+
n += scnprintf(buf + n, len - n, "%s%s%s%s%s%s%s%s\n",
- IS_AVAIL1(cpu->extn_mpy.ver, "mpy "),
+ IS_AVAIL1(cpu->isa.div_rem, "div_rem "),
IS_AVAIL1(cpu->extn.norm, "norm "),
IS_AVAIL1(cpu->extn.barrel, "barrel-shift "),
IS_AVAIL1(cpu->extn.swap, "swap "),
diff --git a/arch/arc/kernel/signal.c b/arch/arc/kernel/signal.c
index b15d2fe..004b7f0 100644
--- a/arch/arc/kernel/signal.c
+++ b/arch/arc/kernel/signal.c
@@ -336,7 +336,7 @@
* their orig user space value when we ret from kernel
*/
regs->r0 = regs->orig_r0;
- regs->ret -= 4;
+ regs->ret -= is_isa_arcv2() ? 2 : 4;
break;
}
}
@@ -377,10 +377,10 @@
if (regs->r0 == -ERESTARTNOHAND ||
regs->r0 == -ERESTARTSYS || regs->r0 == -ERESTARTNOINTR) {
regs->r0 = regs->orig_r0;
- regs->ret -= 4;
+ regs->ret -= is_isa_arcv2() ? 2 : 4;
} else if (regs->r0 == -ERESTART_RESTARTBLOCK) {
regs->r8 = __NR_restart_syscall;
- regs->ret -= 4;
+ regs->ret -= is_isa_arcv2() ? 2 : 4;
}
syscall_wont_restart(regs); /* No more restarts */
}
diff --git a/arch/arc/kernel/troubleshoot.c b/arch/arc/kernel/troubleshoot.c
index e00a018..e0cf998 100644
--- a/arch/arc/kernel/troubleshoot.c
+++ b/arch/arc/kernel/troubleshoot.c
@@ -14,6 +14,7 @@
#include <linux/proc_fs.h>
#include <linux/file.h>
#include <asm/arcregs.h>
+#include <asm/irqflags.h>
/*
* Common routine to print scratch regs (r0-r12) or callee regs (r13-r25)
@@ -34,7 +35,10 @@
n += scnprintf(buf + n, len - n, "\n");
/* because pt_regs has regs reversed: r12..r0, r25..r13 */
- reg_rev--;
+ if (is_isa_arcv2() && start_num == 0)
+ reg_rev++;
+ else
+ reg_rev--;
}
if (start_num != 0)
@@ -152,6 +156,15 @@
((cause_code == 0x02) ? "Write" : "EX"));
} else if (vec == ECR_V_INSN_ERR) {
pr_cont("Illegal Insn\n");
+#ifdef CONFIG_ISA_ARCV2
+ } else if (vec == ECR_V_MEM_ERR) {
+ if (cause_code == 0x00)
+ pr_cont("Bus Error from Insn Mem\n");
+ else if (cause_code == 0x10)
+ pr_cont("Bus Error from Data Mem\n");
+ else
+ pr_cont("Bus Error, check PRM\n");
+#endif
} else {
pr_cont("Check Programmer's Manual\n");
}
@@ -185,12 +198,20 @@
pr_info("[STAT32]: 0x%08lx", regs->status32);
-#define STS_BIT(r, bit) r->status32 & STATUS_##bit##_MASK ? #bit : ""
- if (!user_mode(regs))
- pr_cont(" : %2s %2s %2s %2s %2s\n",
- STS_BIT(regs, AE), STS_BIT(regs, A2), STS_BIT(regs, A1),
- STS_BIT(regs, E2), STS_BIT(regs, E1));
+#define STS_BIT(r, bit) r->status32 & STATUS_##bit##_MASK ? #bit" " : ""
+#ifdef CONFIG_ISA_ARCOMPACT
+ pr_cont(" : %2s%2s%2s%2s%2s%2s%2s\n",
+ (regs->status32 & STATUS_U_MASK) ? "U " : "K ",
+ STS_BIT(regs, DE), STS_BIT(regs, AE),
+ STS_BIT(regs, A2), STS_BIT(regs, A1),
+ STS_BIT(regs, E2), STS_BIT(regs, E1));
+#else
+ pr_cont(" : %2s%2s%2s%2s\n",
+ STS_BIT(regs, IE),
+ (regs->status32 & STATUS_U_MASK) ? "U " : "K ",
+ STS_BIT(regs, DE), STS_BIT(regs, AE));
+#endif
pr_info("BTA: 0x%08lx\t SP: 0x%08lx\t FP: 0x%08lx\n",
regs->bta, regs->sp, regs->fp);
pr_info("LPS: 0x%08lx\tLPE: 0x%08lx\tLPC: 0x%08lx\n",
diff --git a/arch/arc/mm/tlbex.S b/arch/arc/mm/tlbex.S
index d224bf0..00c8d7f 100644
--- a/arch/arc/mm/tlbex.S
+++ b/arch/arc/mm/tlbex.S
@@ -35,8 +35,6 @@
* Rahul Trivedi, Amit Bhor: Codito Technologies 2004
*/
- .cpu A7
-
#include <linux/linkage.h>
#include <asm/entry.h>
#include <asm/mmu.h>
