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[uart] Allow for dynamically registered 16550 UARTs

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Use the generic UART driver-private data pointer, rather than
embedding the generic UART within the 16550 UART structure.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2025-06-21 23:11:56 +01:00
parent 71b4bfb6b2
commit cca1cfd49e
5 changed files with 21 additions and 29 deletions
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13
src/arch/x86/core/x86_uart.c
View File

@@ -35,13 +35,14 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
/** Define a fixed ISA UART */
#define ISA_UART( NAME, BASE ) \
struct ns16550_uart NAME = { \
.uart = { \
.refcnt = REF_INIT ( ref_no_free ), \
.name = #NAME, \
.op = &ns16550_operations, \
}, \
static struct ns16550_uart ns16550_ ## NAME = { \
.base = ( ( void * ) (BASE) ), \
}; \
struct uart NAME = { \
.refcnt = REF_INIT ( ref_no_free ), \
.name = #NAME, \
.op = &ns16550_operations, \
.priv = &ns16550_ ## NAME, \
}
/* Fixed ISA UARTs */

16
src/arch/x86/include/bits/ns16550.h
View File

@@ -46,15 +46,15 @@ ns16550_read ( struct ns16550_uart *ns16550, unsigned int address ) {
#define COM4_BASE 0x2e8
/* Fixed ISA serial ports */
extern struct ns16550_uart com1;
extern struct ns16550_uart com2;
extern struct ns16550_uart com3;
extern struct ns16550_uart com4;
extern struct uart com1;
extern struct uart com2;
extern struct uart com3;
extern struct uart com4;
/* Fixed ISA serial port names */
#define COM1 &com1.uart
#define COM2 &com2.uart
#define COM3 &com3.uart
#define COM4 &com4.uart
#define COM1 &com1
#define COM2 &com2
#define COM3 &com3
#define COM4 &com4
#endif /* _BITS_NS16550_H */

4
src/arch/x86/interface/syslinux/comboot_call.c
View File

@@ -447,9 +447,7 @@ static __asmcall __used void int22 ( struct i386_all_regs *ix86 ) {
case 0x000B: /* Get Serial Console Configuration */
if ( serial_console ) {
struct ns16550_uart *comport =
container_of ( serial_console,
struct ns16550_uart, uart );
struct ns16550_uart *comport = serial_console->priv;
ix86->regs.dx = ( ( intptr_t ) comport->base );
ix86->regs.cx = comport->divisor;