linux-kernel - Re: [PATCH] tpm: introduce struct tpm

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Message-ID: <20150602181315.GE17776@obsidianresearch.com>
Date:	Tue, 2 Jun 2015 12:13:15 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:	peterhuewe@....de, safford@...ibm.com,
	Marcel Selhorst <tpmdd@...horst.net>,
	"moderated list:TPM DEVICE DRIVER" 
	<tpmdd-devel@...ts.sourceforge.net>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tpm: introduce struct tpm_buf

On Tue, Jun 02, 2015 at 04:04:22PM +0300, Jarkko Sakkinen wrote:
> +/* A string buffer type for constructing TPM commands. This is based on the
> + * code in security/keys/trusted.h.
> + */
> +
> +#define TPM_BUF_SIZE 512
> +
> +struct tpm_buf {
> +	u8 data[TPM_BUF_SIZE];

This should be u32 or u64 to guarentee correct alignment for the
casting.


> +};
> +
> +static inline void tpm_buf_init(struct tpm_buf *buf, u16 tag, u32 ordinal)
> +{
> +	struct tpm_input_header *head;
> +
> +	head = (struct tpm_input_header *) buf->data;
> +
> +	head->tag = cpu_to_be16(tag);
> +	head->length = cpu_to_be32(sizeof(*head));
> +	head->ordinal = cpu_to_be32(ordinal);
> +}
> +
> +static inline u32 tpm_buf_length(struct tpm_buf *buf)
> +{
> +	struct tpm_input_header *head = (struct tpm_input_header *) buf->data;
> +
> +	return be32_to_cpu(head->length);
> +}
> +
> +static inline u16 tpm_buf_tag(struct tpm_buf *buf)
> +{
> +	return be16_to_cpu(*(__be16 *) &buf->data[0]);

be16_to_cpup ?

Any thought on someday using this for tpm1 as well?

Jason
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