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Merge tag 'xtensa-20210429' of git://github.com/jcmvbkbc/linux-xtensa
Pull Xtensa updates from Max Filippov: - switch to generic syscall generation scripts - new GDBIO implementation for xtensa semihosting interface - various small code fixes and cleanups - a few typo fixes in comments and Kconfig help text * tag 'xtensa-20210429' of git://github.com/jcmvbkbc/linux-xtensa: xtensa: ISS: add GDBIO implementation to semihosting interface xtensa: ISS: split simcall implementation from semihosting interface xtensa: simcall.h: Change compitible to compatible xtensa: Couple of typo fixes xtensa: drop extraneous register load from initialize_mmu xtensa: fix pgprot_noncached assumptions xtensa: simplify coherent_kvaddr logic xtensa: syscalls: switch to generic syscallhdr.sh xtensa: syscalls: switch to generic syscalltbl.sh xtensa: stop filling syscall array with sys_ni_syscall xtensa: remove unneeded export in boot-elf/Makefile xtensa: move CONFIG_CPU_*_ENDIAN defines to Kconfig xtensa: fix warning comparing pointer to 0 xtensa: fix spelling mistake in Kconfig "wont" -> "won't"
2 parents 8ca5297 + 6a8eb99 commit 437d1a5

18 files changed

Lines changed: 198 additions & 220 deletions

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‎arch/xtensa/Kconfig‎

Lines changed: 29 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -84,6 +84,12 @@ config KASAN_SHADOW_OFFSET
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hex
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default 0x6e400000
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87+
config CPU_BIG_ENDIAN
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def_bool $(success,test "$(shell,echo __XTENSA_EB__ | $(CC) -E -P -)" = 1)
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90+
config CPU_LITTLE_ENDIAN
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def_bool !CPU_BIG_ENDIAN
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8793
menu "Processor type and features"
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choice
@@ -387,6 +393,28 @@ config PARSE_BOOTPARAM
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If unsure, say Y.
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396+
choice
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prompt "Semihosting interface"
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default XTENSA_SIMCALL_ISS
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depends on XTENSA_PLATFORM_ISS
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help
401+
Choose semihosting interface that will be used for serial port,
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block device and networking.
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404+
config XTENSA_SIMCALL_ISS
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bool "simcall"
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help
407+
Use simcall instruction. simcall is only available on simulators,
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it does nothing on hardware.
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config XTENSA_SIMCALL_GDBIO
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bool "GDBIO"
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help
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Use break instruction. It is available on real hardware when GDB
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is attached to it via JTAG.
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endchoice
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config BLK_DEV_SIMDISK
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tristate "Host file-based simulated block device support"
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default n
@@ -466,7 +494,7 @@ config INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
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then enter your normal kernel breakpoints once the MMU was mapped
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to the kernel mappings (0XC0000000).
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This unfortunately won't work for U-Boot and likely also wont
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This unfortunately won't work for U-Boot and likely also won't
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work for using KEXEC to have a hot kernel ready for doing a
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KDUMP.
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‎arch/xtensa/Makefile‎

Lines changed: 1 addition & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -52,14 +52,7 @@ ifneq ($(CONFIG_LD_NO_RELAX),)
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KBUILD_LDFLAGS := --no-relax
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endif
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55-
ifeq ($(shell echo __XTENSA_EB__ | $(CC) -E - | grep -v "\#"),1)
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CHECKFLAGS += -D__XTENSA_EB__
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KBUILD_CPPFLAGS += -DCONFIG_CPU_BIG_ENDIAN
58-
endif
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ifeq ($(shell echo __XTENSA_EL__ | $(CC) -E - | grep -v "\#"),1)
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CHECKFLAGS += -D__XTENSA_EL__
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KBUILD_CPPFLAGS += -DCONFIG_CPU_LITTLE_ENDIAN
62-
endif
55+
CHECKFLAGS += -D$(if $(CONFIG_CPU_BIG_ENDIAN),__XTENSA_EB__,__XTENSA_EL__)
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vardirs := $(patsubst %,arch/xtensa/variants/%/,$(variant-y))
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plfdirs := $(patsubst %,arch/xtensa/platforms/%/,$(platform-y))

‎arch/xtensa/boot/Makefile‎

Lines changed: 0 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -12,10 +12,6 @@
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KBUILD_CFLAGS += -fno-builtin -Iarch/$(ARCH)/boot/include
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HOSTFLAGS += -Iarch/$(ARCH)/boot/include
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BIG_ENDIAN := $(shell echo __XTENSA_EB__ | $(CC) -E - | grep -v "\#")
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export BIG_ENDIAN
18-
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subdir-y := lib
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targets += vmlinux.bin vmlinux.bin.gz
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targets += uImage xipImage

‎arch/xtensa/boot/boot-elf/Makefile‎

Lines changed: 3 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -4,15 +4,10 @@
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# for more details.
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#
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7-
ifeq ($(BIG_ENDIAN),1)
8-
OBJCOPY_ARGS := -O elf32-xtensa-be
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else
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OBJCOPY_ARGS := -O elf32-xtensa-le
11-
endif
7+
OBJCOPY_ARGS := -O $(if $(CONFIG_CPU_BIG_ENDIAN),elf32-xtensa-be,elf32-xtensa-le)
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13-
export OBJCOPY_ARGS
14-
export CPPFLAGS_boot.lds += -P -C
15-
export KBUILD_AFLAGS += -mtext-section-literals
9+
CPPFLAGS_boot.lds += -P -C
10+
KBUILD_AFLAGS += -mtext-section-literals
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boot-y := bootstrap.o
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targets += $(boot-y) boot.lds

‎arch/xtensa/boot/boot-redboot/Makefile‎

Lines changed: 1 addition & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -4,11 +4,7 @@
44
# for more details.
55
#
66

7-
ifeq ($(BIG_ENDIAN),1)
8-
OBJCOPY_ARGS := -O elf32-xtensa-be
9-
else
10-
OBJCOPY_ARGS := -O elf32-xtensa-le
11-
endif
7+
OBJCOPY_ARGS := -O $(if $(CONFIG_CPU_BIG_ENDIAN),elf32-xtensa-be,elf32-xtensa-le)
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139
LD_ARGS = -T $(srctree)/$(obj)/boot.ld
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‎arch/xtensa/include/asm/initialize_mmu.h‎

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Original file line numberDiff line numberDiff line change
@@ -73,7 +73,7 @@
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_j 2f
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.align 4
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1: movi a2, 0x10000000
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1:
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#if CONFIG_KERNEL_LOAD_ADDRESS < 0x40000000ul
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#define TEMP_MAPPING_VADDR 0x40000000

‎arch/xtensa/include/asm/pgtable.h‎

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Original file line numberDiff line numberDiff line change
@@ -280,7 +280,9 @@ static inline pte_t pte_mkyoung(pte_t pte)
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static inline pte_t pte_mkwrite(pte_t pte)
281281
{ pte_val(pte) |= _PAGE_WRITABLE; return pte; }
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283-
#define pgprot_noncached(prot) (__pgprot(pgprot_val(prot) & ~_PAGE_CA_MASK))
283+
#define pgprot_noncached(prot) \
284+
((__pgprot((pgprot_val(prot) & ~_PAGE_CA_MASK) | \
285+
_PAGE_CA_BYPASS)))
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285287
/*
286288
* Conversion functions: convert a page and protection to a page entry,

‎arch/xtensa/kernel/head.S‎

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Original file line numberDiff line numberDiff line change
@@ -212,7 +212,7 @@ ENTRY(_startup)
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*
213213
* The linker script used to build the Linux kernel image
214214
* creates a table located at __boot_reloc_table_start
215-
* that contans the information what data needs to be unpacked.
215+
* that contains the information what data needs to be unpacked.
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*
217217
* Uses a2-a7.
218218
*/
@@ -222,7 +222,7 @@ ENTRY(_startup)
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223223
1: beq a2, a3, 3f # no more entries?
224224
l32i a4, a2, 0 # start destination (in RAM)
225-
l32i a5, a2, 4 # end desination (in RAM)
225+
l32i a5, a2, 4 # end destination (in RAM)
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l32i a6, a2, 8 # start source (in ROM)
227227
addi a2, a2, 12 # next entry
228228
beq a4, a5, 1b # skip, empty entry

‎arch/xtensa/kernel/pci.c‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -76,7 +76,7 @@ int pci_iobar_pfn(struct pci_dev *pdev, int bar, struct vm_area_struct *vma)
7676
struct pci_controller *pci_ctrl = (struct pci_controller*) pdev->sysdata;
7777
resource_size_t ioaddr = pci_resource_start(pdev, bar);
7878

79-
if (pci_ctrl == 0)
79+
if (!pci_ctrl)
8080
return -EINVAL; /* should never happen */
8181

8282
/* Convert to an offset within this PCI controller */

‎arch/xtensa/kernel/syscall.c‎

Lines changed: 2 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -17,7 +17,6 @@
1717
*/
1818
#include <linux/uaccess.h>
1919
#include <asm/syscall.h>
20-
#include <asm/unistd.h>
2120
#include <linux/linkage.h>
2221
#include <linux/stringify.h>
2322
#include <linux/errno.h>
@@ -28,12 +27,9 @@
2827
#include <linux/sched/mm.h>
2928
#include <linux/shm.h>
3029

31-
syscall_t sys_call_table[__NR_syscalls] /* FIXME __cacheline_aligned */= {
32-
[0 ... __NR_syscalls - 1] = (syscall_t)&sys_ni_syscall,
33-
34-
#define __SYSCALL(nr, entry, nargs)[nr] = (syscall_t)entry,
30+
syscall_t sys_call_table[] /* FIXME __cacheline_aligned */= {
31+
#define __SYSCALL(nr, entry) (syscall_t)entry,
3532
#include <asm/syscall_table.h>
36-
#undef __SYSCALL
3733
};
3834

3935
#define COLOUR_ALIGN(addr, pgoff) \

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