// SPDX-License-Identifier: GPL-2.0/* * Implement the default iomap interfaces * * (C) Copyright 2004 Linus Torvalds */#include <linux/pci.h>#include <linux/io.h>#include <linux/kmsan-checks.h> #include <linux/export.h> /* * Read/write from/to an (offsettable) iomem cookie. It might be a PIO * access or a MMIO access, these functions don't care. The info is * encoded in the hardware mapping set up by the mapping functions * (or the cookie itself, depending on implementation and hw). * * The generic routines don't assume any hardware mappings, and just * encode the PIO/MMIO as part of the cookie. They coldly assume that * the MMIO IO mappings are not in the low address range. * * Architectures for which this is not true can't use this generic * implementation and should do their own copy. */ #ifndef HAVE_ARCH_PIO_SIZE/* * We encode the physical PIO addresses (0-0xffff) into the * pointer by offsetting them with a constant (0x10000) and * assuming that all the low addresses are always PIO. That means * we can do some sanity checks on the low bits, and don't * need to just take things for granted. */#define PIO_OFFSET	0x10000UL#define PIO_MASK	0x0ffffUL#define PIO_RESERVED	0x40000UL#endif static void bad_io_access(unsigned long port, const char *access){	static int count = 10;	if (count) {		count--;		WARN(1, KERN_ERR "Bad IO access at port %#lx (%s)\n", port, access);	}} /* * Ugly macros are a way of life. */#define IO_COND(addr, is_pio, is_mmio) do {			\	unsigned long port = (unsigned long __force)addr;	\	if (port >= PIO_RESERVED) {				\		is_mmio;					\	} else if (port > PIO_OFFSET) {				\		port &= PIO_MASK;				\		is_pio;						\	} else							\		bad_io_access(port, #is_pio );			\} while (0) #ifndef pio_read16be#define pio_read16be(port) swab16(inw(port))#define pio_read32be(port) swab32(inl(port))#endif #ifndef mmio_read16be#define mmio_read16be(addr) swab16(readw(addr))#define mmio_read32be(addr) swab32(readl(addr))#define mmio_read64be(addr) swab64(readq(addr))#endif /* * Here and below, we apply __no_kmsan_checks to functions reading data from * hardware, to ensure that KMSAN marks their return values as initialized. */__no_kmsan_checksunsigned int ioread8(const void __iomem *addr){	IO_COND(addr, return inb(port), return readb(addr));	return 0xff;}__no_kmsan_checksunsigned int ioread16(const void __iomem *addr){	IO_COND(addr, return inw(port), return readw(addr));	return 0xffff;}__no_kmsan_checksunsigned int ioread16be(const void __iomem *addr){	IO_COND(addr, return pio_read16be(port), return mmio_read16be(addr));	return 0xffff;}__no_kmsan_checksunsigned int ioread32(const void __iomem *addr){	IO_COND(addr, return inl(port), return readl(addr));	return 0xffffffff;}__no_kmsan_checksunsigned int ioread32be(const void __iomem *addr){	IO_COND(addr, return pio_read32be(port), return mmio_read32be(addr));	return 0xffffffff;}EXPORT_SYMBOL(ioread8);EXPORT_SYMBOL(ioread16);EXPORT_SYMBOL(ioread16be);EXPORT_SYMBOL(ioread32);EXPORT_SYMBOL(ioread32be); #ifdef CONFIG_64BITstatic u64 pio_read64_lo_hi(unsigned long port){	u64 lo, hi; 	lo = inl(port);	hi = inl(port + sizeof(u32)); 	return lo | (hi << 32);} static u64 pio_read64_hi_lo(unsigned long port){	u64 lo, hi; 	hi = inl(port + sizeof(u32));	lo = inl(port); 	return lo | (hi << 32);} static u64 pio_read64be_lo_hi(unsigned long port){	u64 lo, hi; 	lo = pio_read32be(port + sizeof(u32));	hi = pio_read32be(port); 	return lo | (hi << 32);} static u64 pio_read64be_hi_lo(unsigned long port){	u64 lo, hi; 	hi = pio_read32be(port);	lo = pio_read32be(port + sizeof(u32)); 	return lo | (hi << 32);} __no_kmsan_checksu64 __ioread64_lo_hi(const void __iomem *addr){	IO_COND(addr, return pio_read64_lo_hi(port), return readq(addr));	return 0xffffffffffffffffULL;} __no_kmsan_checksu64 __ioread64_hi_lo(const void __iomem *addr){	IO_COND(addr, return pio_read64_hi_lo(port), return readq(addr));	return 0xffffffffffffffffULL;} __no_kmsan_checksu64 __ioread64be_lo_hi(const void __iomem *addr){	IO_COND(addr, return pio_read64be_lo_hi(port),		return mmio_read64be(addr));	return 0xffffffffffffffffULL;} __no_kmsan_checksu64 __ioread64be_hi_lo(const void __iomem *addr){	IO_COND(addr, return pio_read64be_hi_lo(port),		return mmio_read64be(addr));	return 0xffffffffffffffffULL;} EXPORT_SYMBOL(__ioread64_lo_hi);EXPORT_SYMBOL(__ioread64_hi_lo);EXPORT_SYMBOL(__ioread64be_lo_hi);EXPORT_SYMBOL(__ioread64be_hi_lo); #endif /* CONFIG_64BIT */ #ifndef pio_write16be#define pio_write16be(val,port) outw(swab16(val),port)#define pio_write32be(val,port) outl(swab32(val),port)#endif #ifndef mmio_write16be#define mmio_write16be(val,port) writew(swab16(val),port)#define mmio_write32be(val,port) writel(swab32(val),port)#define mmio_write64be(val,port) writeq(swab64(val),port)#endif void iowrite8(u8 val, void __iomem *addr){	/* Make sure uninitialized memory isn't copied to devices. */	kmsan_check_memory(&val, sizeof(val));	IO_COND(addr, outb(val,port), writeb(val, addr));}void iowrite16(u16 val, void __iomem *addr){	/* Make sure uninitialized memory isn't copied to devices. */	kmsan_check_memory(&val, sizeof(val));	IO_COND(addr, outw(val,port), writew(val, addr));}void iowrite16be(u16 val, void __iomem *addr){	/* Make sure uninitialized memory isn't copied to devices. */	kmsan_check_memory(&val, sizeof(val));	IO_COND(addr, pio_write16be(val,port), mmio_write16be(val, addr));}void iowrite32(u32 val, void __iomem *addr){	/* Make sure uninitialized memory isn't copied to devices. */	kmsan_check_memory(&val, sizeof(val));	IO_COND(addr, outl(val,port), writel(val, addr));}void iowrite32be(u32 val, void __iomem *addr){	/* Make sure uninitialized memory isn't copied to devices. */	kmsan_check_memory(&val, sizeof(val));	IO_COND(addr, pio_write32be(val,port), mmio_write32be(val, addr));}EXPORT_SYMBOL(iowrite8);EXPORT_SYMBOL(iowrite16);EXPORT_SYMBOL(iowrite16be);EXPORT_SYMBOL(iowrite32);EXPORT_SYMBOL(iowrite32be); #ifdef CONFIG_64BITstatic void pio_write64_lo_hi(u64 val, unsigned long port){	outl(val, port);	outl(val >> 32, port + sizeof(u32));} static void pio_write64_hi_lo(u64 val, unsigned long port){	outl(val >> 32, port + sizeof(u32));	outl(val, port);} static void pio_write64be_lo_hi(u64 val, unsigned long port){	pio_write32be(val, port + sizeof(u32));	pio_write32be(val >> 32, port);} static void pio_write64be_hi_lo(u64 val, unsigned long port){	pio_write32be(val >> 32, port);	pio_write32be(val, port + sizeof(u32));} void __iowrite64_lo_hi(u64 val, void __iomem *addr){	/* Make sure uninitialized memory isn't copied to devices. */	kmsan_check_memory(&val, sizeof(val));	IO_COND(addr, pio_write64_lo_hi(val, port),		writeq(val, addr));} void __iowrite64_hi_lo(u64 val, void __iomem *addr){	/* Make sure uninitialized memory isn't copied to devices. */	kmsan_check_memory(&val, sizeof(val));	IO_COND(addr, pio_write64_hi_lo(val, port),		writeq(val, addr));} void __iowrite64be_lo_hi(u64 val, void __iomem *addr){	/* Make sure uninitialized memory isn't copied to devices. */	kmsan_check_memory(&val, sizeof(val));	IO_COND(addr, pio_write64be_lo_hi(val, port),		mmio_write64be(val, addr));} void __iowrite64be_hi_lo(u64 val, void __iomem *addr){	/* Make sure uninitialized memory isn't copied to devices. */	kmsan_check_memory(&val, sizeof(val));	IO_COND(addr, pio_write64be_hi_lo(val, port),		mmio_write64be(val, addr));} EXPORT_SYMBOL(__iowrite64_lo_hi);EXPORT_SYMBOL(__iowrite64_hi_lo);EXPORT_SYMBOL(__iowrite64be_lo_hi);EXPORT_SYMBOL(__iowrite64be_hi_lo); #endif /* CONFIG_64BIT */ /* * These are the "repeat MMIO read/write" functions. * Note the "__raw" accesses, since we don't want to * convert to CPU byte order. We write in "IO byte * order" (we also don't have IO barriers). */#ifndef mmio_insbstatic inline void mmio_insb(const void __iomem *addr, u8 *dst, int count){	while (--count >= 0) {		u8 data = __raw_readb(addr);		*dst = data;		dst++;	}}static inline void mmio_insw(const void __iomem *addr, u16 *dst, int count){	while (--count >= 0) {		u16 data = __raw_readw(addr);		*dst = data;		dst++;	}}static inline void mmio_insl(const void __iomem *addr, u32 *dst, int count){	while (--count >= 0) {		u32 data = __raw_readl(addr);		*dst = data;		dst++;	}}#endif #ifndef mmio_outsbstatic inline void mmio_outsb(void __iomem *addr, const u8 *src, int count){	while (--count >= 0) {		__raw_writeb(*src, addr);		src++;	}}static inline void mmio_outsw(void __iomem *addr, const u16 *src, int count){	while (--count >= 0) {		__raw_writew(*src, addr);		src++;	}}static inline void mmio_outsl(void __iomem *addr, const u32 *src, int count){	while (--count >= 0) {		__raw_writel(*src, addr);		src++;	}}#endif void ioread8_rep(const void __iomem *addr, void *dst, unsigned long count){	IO_COND(addr, insb(port,dst,count), mmio_insb(addr, dst, count));	/* KMSAN must treat values read from devices as initialized. */	kmsan_unpoison_memory(dst, count);}void ioread16_rep(const void __iomem *addr, void *dst, unsigned long count){	IO_COND(addr, insw(port,dst,count), mmio_insw(addr, dst, count));	/* KMSAN must treat values read from devices as initialized. */	kmsan_unpoison_memory(dst, count * 2);}void ioread32_rep(const void __iomem *addr, void *dst, unsigned long count){	IO_COND(addr, insl(port,dst,count), mmio_insl(addr, dst, count));	/* KMSAN must treat values read from devices as initialized. */	kmsan_unpoison_memory(dst, count * 4);}EXPORT_SYMBOL(ioread8_rep);EXPORT_SYMBOL(ioread16_rep);EXPORT_SYMBOL(ioread32_rep); void iowrite8_rep(void __iomem *addr, const void *src, unsigned long count){	/* Make sure uninitialized memory isn't copied to devices. */	kmsan_check_memory(src, count);	IO_COND(addr, outsb(port, src, count), mmio_outsb(addr, src, count));}void iowrite16_rep(void __iomem *addr, const void *src, unsigned long count){	/* Make sure uninitialized memory isn't copied to devices. */	kmsan_check_memory(src, count * 2);	IO_COND(addr, outsw(port, src, count), mmio_outsw(addr, src, count));}void iowrite32_rep(void __iomem *addr, const void *src, unsigned long count){	/* Make sure uninitialized memory isn't copied to devices. */	kmsan_check_memory(src, count * 4);	IO_COND(addr, outsl(port, src,count), mmio_outsl(addr, src, count));}EXPORT_SYMBOL(iowrite8_rep);EXPORT_SYMBOL(iowrite16_rep);EXPORT_SYMBOL(iowrite32_rep); #ifdef CONFIG_HAS_IOPORT_MAP/* Create a virtual mapping cookie for an IO port range */void __iomem *ioport_map(unsigned long port, unsigned int nr){	if (port > PIO_MASK)		return NULL;	return (void __iomem *) (unsigned long) (port + PIO_OFFSET);} void ioport_unmap(void __iomem *addr){	/* Nothing to do */}EXPORT_SYMBOL(ioport_map);EXPORT_SYMBOL(ioport_unmap);#endif /* CONFIG_HAS_IOPORT_MAP */ #ifdef CONFIG_PCI/* Hide the details if this is a MMIO or PIO address space and just do what * you expect in the correct way. */void pci_iounmap(struct pci_dev *dev, void __iomem * addr){	IO_COND(addr, /* nothing */, iounmap(addr));}EXPORT_SYMBOL(pci_iounmap);#endif /* CONFIG_PCI */