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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#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 */