[OpenBIOS] [RFC 3/3] ppc: RTAS WIP

[Andreas Färber]

Am 15.10.2010 um 00:17 schrieb Andreas Färber:

> diff --git a/arch/ppc/qemu/rtas-tokens.c b/arch/ppc/qemu/rtas-tokens.c
> new file mode 100644
> index 0000000..f251716
> --- /dev/null
> +++ b/arch/ppc/qemu/rtas-tokens.c
> @@ -0,0 +1,63 @@
> +/*
> + * Copyright (c) 2010 Andreas Färber <andreas.faerber at web.de>
> + */
> +
> +#define RTAS_MAX_ARGS	10
> +
> +typedef struct rtas_args {
> +	unsigned long	token;
> +	long			nargs;
> +	long			nret;
> +	unsigned long	args[RTAS_MAX_ARGS];
> +} rtas_args_t;
> +
> +void rtas_interface(rtas_args_t*, void*);
> +
> +/* drivers/escc.h */
> +#define IO_ESCC_OFFSET  0x00013000
> +/* drivers/escc.c */
> +#define CTRL(addr) (*(volatile unsigned char *)(addr))
> +#define DATA(addr) (*(volatile unsigned char *)(addr + 16))
> +#define Tx_BUF_EMP      0x4     /* Tx Buffer empty */
> +
> +/*static void uart_putchar(int port, unsigned char c)
> +{
> +    while (!(CTRL(port) & Tx_BUF_EMP))
> +        ;
> +    DATA(port) = c;
> +}*/
> +
> +/*void serial_putchar(char);*/
> +
> +static void serial_putchar(char c)
> +{
> +	unsigned long addr = 0x80800000;
> +	volatile unsigned char *serial_dev = (unsigned char *)addr +  
> IO_ESCC_OFFSET + 0x20;
> +	//uart_putchar((int)serial_dev, c);
> +	volatile unsigned char * port = serial_dev;
> +    while (!(CTRL(port) & Tx_BUF_EMP))
> +        ;
> +    DATA(port) = c;
> +}

If I add a new method void dprintk(const char* s) here, I get this:

   CC    target/arch/ppc/qemu/rtas-tokens.o
   LINK  rtas-qemu.bin
target/arch/ppc/qemu/rtas-tokens.o: In function `rtas_interface':
/Users/andreas/QEMU/OpenBIOS/openbios/obj-ppc/../arch/ppc/qemu/rtas- 
tokens.c:51: undefined reference to `_GLOBAL_OFFSET_TABLE_'
make: *** [rtas-qemu.bin] Error 1

Any ideas? Isn't the GOT some ELF concept?

$ powerpc-elf-gcc -v
Using built-in specs.
COLLECT_GCC=powerpc-elf-gcc
COLLECT_LTO_WRAPPER=/Users/andreas/QEMU/OpenBIOS/bin/libexec/gcc/ 
powerpc-elf/4.5.1/lto-wrapper
Target: powerpc-elf
Configured with: ../gcc-4.5.1/configure --prefix=/Users/andreas/QEMU/ 
OpenBIOS/bin --target=powerpc-elf --disable-nls --disable-threads -- 
enable-languages=c --disable-shared --disable-libssp --with-gmp=/Users/ 
andreas/QEMU/OpenBIOS/bin --with-mpfr=/Users/andreas/QEMU/OpenBIOS/bin
Thread model: single
gcc version 4.5.1 (GCC)

Andreas

> +enum {
> +	DISPLAY_CHARACTER = 1,
> +};
> +
> +void rtas_interface(rtas_args_t* params, void* privateData)
> +{
> +	switch (params->token) {
> +		case DISPLAY_CHARACTER: {
> +			serial_putchar((char)params->args[0]);
> +			serial_putchar('x');
> +			params->args[params->nargs] = 0;
> +			break;
> +		}
> +		default:
> +			serial_putchar('.');
> +			params->args[params->nargs] = -1;
> +			break;
> +	}
> +	serial_putchar('\r');
> +	serial_putchar('\n');
> +}