diff options
Diffstat (limited to 'fs/fs.c')
| -rw-r--r-- | fs/fs.c | 54 |
1 files changed, 53 insertions, 1 deletions
@@ -485,7 +485,11 @@ int erase(int fd, size_t count, unsigned long offset) if (f->pos + count > f->size) count = f->size - f->pos; - errno = fsdrv->erase(dev, f, count, offset); + + if (fsdrv->erase) + errno = fsdrv->erase(dev, f, count, offset); + else + errno = -EINVAL; return errno; } @@ -749,3 +753,51 @@ out: return errno; } +static void memcpy_sz(void *_dst, const void *_src, ulong count, ulong rwsize) +{ + ulong dst = (ulong)_dst; + ulong src = (ulong)_src; + + /* no rwsize specification given. Do whatever memcpy likes best */ + if (!rwsize) { + memcpy(_dst, _src, count); + return; + } + + rwsize = rwsize >> O_RWSIZE_SHIFT; + + count /= rwsize; + + while (count-- > 0) { + switch (rwsize) { + case 1: + *((u_char *)dst) = *((u_char *)src); + break; + case 2: + *((ushort *)dst) = *((ushort *)src); + break; + case 4: + *((ulong *)dst) = *((ulong *)src); + break; + } + dst += rwsize; + src += rwsize; + } +} + +ssize_t mem_read(struct device_d *dev, void *buf, size_t count, ulong offset, ulong flags) +{ + ulong size; + size = min(count, dev->size - offset); + debug("mem_read: dev->map_base: %p size: %d offset: %d\n",dev->map_base, size, offset); + memcpy_sz(buf, (void *)(dev->map_base + offset), size, flags & O_RWSIZE_MASK); + return size; +} + +ssize_t mem_write(struct device_d *dev, const void *buf, size_t count, ulong offset, ulong flags) +{ + ulong size; + size = min(count, dev->size - offset); + memcpy_sz((void *)(dev->map_base + offset), buf, size, flags & O_RWSIZE_MASK); + return size; +} |