Thread (130 messages) 130 messages, 16 authors, 2021-03-23

Re: [dpdk-dev] [PATCH v3 03/15] bus/pci: add fallback for out[lwb]_p for non GNU libc

From: Natanael Copa <hidden>
Date: 2019-07-04 15:30:28

On Thu, 04 Jul 2019 15:20:55 +0200
Thomas Monjalon [off-list ref] wrote:
04/07/2019 14:16, Natanael Copa:
quoted
On Sat, 30 Mar 2019 23:22:27 +0100
Thomas Monjalon [off-list ref] wrote:
  
quoted
13/03/2019 18:06, Natanael Copa:  
quoted
Add a fallback for non-GNU libc systems like musl libc for the
non-standard functions  outl_p, outw_p and outb_p.

This ifixes 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'

fixes https://bugs.dpdk.org/show_bug.cgi?id=35    
Please use this syntax:
Bugzilla ID: 35  
Ok.
  
quoted
[...]  
quoted
 #if defined(RTE_ARCH_X86)
 #include <sys/io.h>
+#if defined(__GLIBC__)
+#define pci_uio_outl_p outl_p
+#define pci_uio_outw_p outw_p
+#define pci_uio_outb_p outb_p
+#else
+static inline void
+pci_uio_outl_p(unsigned int value, unsigned short int port)
+{
+	__asm__ __volatile__ ("outl %0,%w1\noutb %%al,$0x80" : : "a" (value),
+			      "Nd" (port));
+}
+
+static inline void
+pci_uio_outw_p(unsigned short int value, unsigned short int port)
+{
+	__asm__ __volatile__ ("outw %w0,%w1\noutb %%al,$0x80" : : "a" (value),
+			      "Nd" (port));
+}
+
+static inline void
+pci_uio_outb_p(unsigned char value, unsigned short int port)
+{
+	__asm__ __volatile__ ("outb %b0,%w1\noutb %%al,$0x80" : : "a" (value),
+			      "Nd" (port));
+}
+#endif
 #endif    
[...]  
quoted
 #if defined(RTE_ARCH_X86)
-			outl_p(*(const uint32_t *)s, reg);
+			pci_uio_outl_p(*(const uint32_t *)s, reg);
 #else
 			*(volatile uint32_t *)reg = *(const uint32_t *)s;
 #endif    
Could we manage non-x86 case in the macros pci_uio_out?  
I did that in separate commit. Do you want do both in same commit?  
Maybe change the order of commits?
That would mean that first commit would use a define or inline that is
not yet introduced :)
Anyway I think you need to rebase and resend this series :)
I'm on it. Thanks for your feedback.

-nc
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