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new-bus: Add resource_validate_map_request function

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This helper function for BUS_MAP_RESOURCE performs common argument
validation.

Reviewed by:	imp
Differential Revision:	https://reviews.freebsd.org/D42723
This commit is contained in:
John Baldwin 2023-11-23 09:06:24 -08:00
parent 8c4ee0b22c
commit 19f073c612
2 changed files with 36 additions and 1 deletions
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31
sys/kern/subr_bus.c
View file

@ -2715,6 +2715,37 @@ resource_init_map_request_impl(struct resource_map_request *args, size_t sz)
args->memattr = VM_MEMATTR_DEVICE;
}
int
resource_validate_map_request(struct resource *r,
struct resource_map_request *in, struct resource_map_request *out,
rman_res_t *startp, rman_res_t *lengthp)
{
rman_res_t end, length, start;
/*
* This assumes that any callers of this function are compiled
* into the kernel and use the same version of the structure
* as this file.
*/
MPASS(out->size == sizeof(struct resource_map_request));
if (in != NULL)
bcopy(in, out, imin(in->size, out->size));
start = rman_get_start(r) + out->offset;
if (out->length == 0)
length = rman_get_size(r);
else
length = out->length;
end = start + length - 1;
if (start > rman_get_end(r) || start < rman_get_start(r))
return (EINVAL);
if (end > rman_get_end(r) || end < start)
return (EINVAL);
*lengthp = length;
*startp = start;
return (0);
}
/**
* @brief Initialise a resource list.
*

6
sys/sys/bus.h
View file

@ -317,6 +317,8 @@ struct driver {
KOBJ_CLASS_FIELDS;
};
struct resource;
/**
* @brief A resource mapping.
*/
@ -341,12 +343,14 @@ void resource_init_map_request_impl(struct resource_map_request *_args,
size_t _sz);
#define resource_init_map_request(rmr) \
resource_init_map_request_impl((rmr), sizeof(*(rmr)))
int resource_validate_map_request(struct resource *r,
struct resource_map_request *in, struct resource_map_request *out,
rman_res_t *startp, rman_res_t *lengthp);
/*
* Definitions for drivers which need to keep simple lists of resources
* for their child devices.
*/
struct resource;
/**
* @brief An entry for a single resource in a resource list.