Re: [kvm-ppc-devel] [PATCH 7 of 7] Add ability to specify ram

[Hollis Blanchard <hollisb@us.ibm.com>]

On Tue, 2008-03-18 at 15:06 -0500, Jerone Young wrote:
> # HG changeset patch
> # User Jerone Young <jyoung5@us.ibm.com>
> # Date 1205870472 18000
> # Branch merge
> # Node ID 4f90f7d25186f55bfb1503764af5264201df067f
> # Parent  ac0fc9dfd78d2eddd083326e9b635a9286fc3b19
> Add ability to specify ram on command line for bamboo board model
> 
> This patch adds the ability to now specify ram sizes on the command line.
> Due to the nature of the code there are restictions on exactly how
> much ram and the multiple that the size must match.
> 
> Signed-off-by: Jerone Young <jyoung5@us.ibm.com>
> 
> diff --git a/qemu/hw/ppc440_bamboo.c b/qemu/hw/ppc440_bamboo.c
> --- a/qemu/hw/ppc440_bamboo.c
> +++ b/qemu/hw/ppc440_bamboo.c
> @@ -15,6 +15,9 @@
> 
>  #define BINARY_DEVICE_TREE_FILE "bamboo.dtb"
> 
> +#define bytes_to_mb(a) (a>>20)
> +#define mb_to_bytes(a) (a<<20)
> +
>  /* PPC 440 refrence demo board
>   *
>   * 440 PowerPC CPU
> @@ -28,7 +31,7 @@ void bamboo_init(ram_addr_t ram_size, in
>  			const char *cpu_model)
>  {
>  	char buf[1024];	
> -	target_phys_addr_t ram_bases[2], ram_sizes[2];
> +	target_phys_addr_t ram_bases[2], ram_sizes[2]; 
>  	qemu_irq *pic;
>  	CPUState *env;
>  	target_ulong ep=0;

Here you have added a trailing space.

> @@ -40,32 +43,39 @@ void bamboo_init(ram_addr_t ram_size, in
>  	target_ulong dt_base=0;
>  	void *fdt;
>  	int ret;
> +	int ram_stick_sizes[] = {256, 128, 64, 32, 16, 8 }; /* in Mega bytes */
> +	ram_addr_t tmp_ram_size;
> +	int i=0, k=0;

Define ram_stick_sizes[] in MB and then remove all the shifting inside
the loops.

>  	uint32_t cpu_freq;
>  	uint32_t timebase_freq;
> 
>  	printf("%s: START\n", __func__);
> 
> -	/* Setup Memory */
> -	if (ram_size) {
> -		printf("Ram size specified on command line is %i bytes\n",
> -								(int)ram_size);
> -		printf("WARNING: RAM is hard coded to 144MB\n");
> -	}
> -	else {
> -		printf("Using defualt ram size of %iMB\n",
> -						((int)ram_size/1024)/1024);
> + 	/* Setup Memory */
> + 	printf("Ram size passed is: %i MB\n",
> + 				bytes_to_mb((int)ram_size));
> +
> +	tmp_ram_size = ram_size;
> + 
> +	for (i=0; i < (sizeof(ram_sizes)/sizeof(ram_sizes[0])); i++)
> +	{
> +		for (k=0; k < (sizeof(ram_stick_sizes)/sizeof(ram_stick_sizes[0])); k++)
> +		{
> +			if ((bytes_to_mb(ram_size)/ram_stick_sizes[k]) > 0)
> +			{

Don't divide, just use a logical comparison.

Also, put all the open-braces on the previous lines.

> +				ram_sizes[i] = mb_to_bytes(ram_stick_sizes[k]);
> +				tmp_ram_size -= mb_to_bytes(ram_stick_sizes[k]);
> +				break;
> +			}
> +		}
>  	}
> -	/* Each bank can only have memory in configurations of
> -	 *   16MB, 32MB, 64MB, 128MB, or 256MB
> -	 */
> -	ram_bases[0] = 0x0;
> -	ram_sizes[0] = 0x08000000;
> -	ram_bases[1] = 0x0;
> -	ram_sizes[1] = 0x01000000;
> -
> -	printf("Ram size of domain is %d bytes\n", (int)ram_size);
> +	if (tmp_ram_size) {
> +		printf("WARNING: %i MB left over memory is ram\n", 
> +			bytes_to_mb((int)tmp_ram_size));
> +		ram_size -= tmp_ram_size;
> +	}
> 
>  	/* Setup CPU */
>  	env = cpu_ppc_init("440");

Remove tmp_ram_size completely. Just decrement ram_size in the loop and
check if it's non-zero at the end.

-- 
Hollis Blanchard
IBM Linux Technology Center


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