[dpdk-dev] [PATCH v4 3/8] bus/pci: add fallback for out* for non GNU libc

[Natanael Copa <ncopa@alpinelinux.org>]

Add a fallback for non-GNU libc systems like musl libc for the
non-standard functions  outl_p, outw_p and outb_p.

This solves the following buildtime errors when building with musl libc:
pci_uio.c:(.text+0xaa1): undefined reference to `outw_p'
pci_uio.c:(.text+0xac5): undefined reference to `outl_p'
pci_uio.c:(.text+0xadf): undefined reference to `outb_p'

We also handle the non-x86 with macros to factor out various ifdefs in
the code.

Bugzilla ID: 35

Fixes: c752998b5e2e ("pci: introduce library and driver")
Cc: stable@dpdk.org

Signed-off-by: Natanael Copa <ncopa@alpinelinux.org>
---
 drivers/bus/pci/linux/pci_uio.c | 95 ++++++++++++++++++++++-----------
 1 file changed, 64 insertions(+), 31 deletions(-)

diff --git a/drivers/bus/pci/linux/pci_uio.c b/drivers/bus/pci/linux/pci_uio.c
index f3305a2f2..626c8a2cc 100644
--- a/drivers/bus/pci/linux/pci_uio.c
+++ b/drivers/bus/pci/linux/pci_uio.c
@@ -14,7 +14,64 @@
 
 #if defined(RTE_ARCH_X86)
 #include <sys/io.h>
-#endif
+
+#define pci_uio_inl(reg) inl(reg)
+#define pci_uio_inw(reg) inw(reg)
+#define pci_uio_inb(reg) inb(reg)
+
+#else /* RTE_ARCH_X86 */
+
+#define pci_uio_inl(reg) (*(volatile uint32_t *)(reg))
+#define pci_uio_inw(reg) (*(volatile uint16_t *)(reg))
+#define pci_uio_inb(reg) (*(volatile uint8_t *)(reg))
+
+#endif /* RTE_ARCH_X86 */
+
+
+#if defined(RTE_ARCH_X86)
+static inline void
+pci_uio_outl_p(unsigned int value, unsigned short int port)
+{
+#if defined(__GLIBC__)
+	outl_p(value, port);
+#else /* __GLIBC__ */
+	__asm__ __volatile__ ("outl %0,%w1\noutb %%al,$0x80" : : "a" (value),
+			      "Nd" (port));
+#endif /* __GLIBC__ */
+}
+#else /* RTE_ARCH_X86 */
+#define pci_uio_outl_p(value, reg) (*(volatile uint32_t *)(reg) = (value))
+#endif /* RTE_ARCH_X86 */
+
+#if defined(RTE_ARCH_X86)
+static inline void
+pci_uio_outw_p(unsigned short int value, unsigned short int port)
+{
+#if defined(__GLIBC__)
+	outw_p(value, port);
+#else /* __GLIBC__ */
+	__asm__ __volatile__ ("outw %w0,%w1\noutb %%al,$0x80" : : "a" (value),
+			      "Nd" (port));
+#endif /* __GLIBC__ */
+}
+#else /* RTE_ARCH_X86 */
+#define pci_uio_outw_p(value, reg) (*(volatile uint16_t *)(reg) = (value))
+#endif /* RTE_ARCH_X86 */
+
+#if defined(RTE_ARCH_X86)
+static inline void
+pci_uio_outb_p(unsigned char value, unsigned short int port)
+{
+#if defined(__GLIBC__)
+	outb_p(value, port);
+#else /* __GLIBC__ */
+	__asm__ __volatile__ ("outb %b0,%w1\noutb %%al,$0x80" : : "a" (value),
+			      "Nd" (port));
+#endif /* __GLIBC__ */
+}
+#else /* RTE_ARCH_X86 */
+#define pci_uio_outb_p(value, reg) (*(volatile uint8_t *)(reg) = (value))
+#endif /* RTE_ARCH_X86 */
 
 #include <rte_string_fns.h>
 #include <rte_log.h>
@@ -500,25 +557,13 @@ pci_uio_ioport_read(struct rte_pci_ioport *p,
 	for (d = data; len > 0; d += size, reg += size, len -= size) {
 		if (len >= 4) {
 			size = 4;
-#if defined(RTE_ARCH_X86)
-			*(uint32_t *)d = inl(reg);
-#else
-			*(uint32_t *)d = *(volatile uint32_t *)reg;
-#endif
+			*(uint32_t *)d = pci_uio_inl(reg);
 		} else if (len >= 2) {
 			size = 2;
-#if defined(RTE_ARCH_X86)
-			*(uint16_t *)d = inw(reg);
-#else
-			*(uint16_t *)d = *(volatile uint16_t *)reg;
-#endif
+			*(uint16_t *)d = pci_uio_inw(reg);
 		} else {
 			size = 1;
-#if defined(RTE_ARCH_X86)
-			*d = inb(reg);
-#else
-			*d = *(volatile uint8_t *)reg;
-#endif
+			*d = pci_uio_inb(reg);
 		}
 	}
 }
@@ -534,25 +579,13 @@ pci_uio_ioport_write(struct rte_pci_ioport *p,
 	for (s = data; len > 0; s += size, reg += size, len -= size) {
 		if (len >= 4) {
 			size = 4;
-#if defined(RTE_ARCH_X86)
-			outl_p(*(const uint32_t *)s, reg);
-#else
-			*(volatile uint32_t *)reg = *(const uint32_t *)s;
-#endif
+			pci_uio_outl_p(*(const uint32_t *)s, reg);
 		} else if (len >= 2) {
 			size = 2;
-#if defined(RTE_ARCH_X86)
-			outw_p(*(const uint16_t *)s, reg);
-#else
-			*(volatile uint16_t *)reg = *(const uint16_t *)s;
-#endif
+			pci_uio_outw_p(*(const uint16_t *)s, reg);
 		} else {
 			size = 1;
-#if defined(RTE_ARCH_X86)
-			outb_p(*s, reg);
-#else
-			*(volatile uint8_t *)reg = *s;
-#endif
+			pci_uio_outb_p(*s, reg);
 		}
 	}
 }
-- 
2.29.2