| 85 |
|
|
| 86 |
|
/* |
| 87 |
|
* Helpers to share 32-bit addressable data with MacOS |
| 88 |
+ |
* |
| 89 |
+ |
* There are two distinct allocatable regions: |
| 90 |
+ |
* |
| 91 |
+ |
* - The Data region is used to share data between MacOS and |
| 92 |
+ |
* SheepShaver. This is stack-like allocation since it is |
| 93 |
+ |
* meant to only hold temporary data which dies at the end |
| 94 |
+ |
* of the current function scope. |
| 95 |
+ |
* |
| 96 |
+ |
* - The Procedure region is used to hold permanent M68K or |
| 97 |
+ |
* PowerPC code to assist native routine implementations. |
| 98 |
+ |
* |
| 99 |
+ |
* - The Procedure region grows up whereas the Data region |
| 100 |
+ |
* grows down. They may intersect into the ZeroPage, which |
| 101 |
+ |
* is a read-only page with all bits set to zero. In practise, |
| 102 |
+ |
* the intersection is unlikely since the Procedure region is |
| 103 |
+ |
* static and the Data region is meant to be small (< 256 KB). |
| 104 |
|
*/ |
| 105 |
|
|
| 106 |
|
class SheepMem { |
| 109 |
|
static uint32 page_size; |
| 110 |
|
static uintptr zero_page; |
| 111 |
|
static uintptr base; |
| 112 |
< |
static uintptr top; |
| 113 |
< |
static const uint32 size = 0x40000; // 256 KB |
| 112 |
> |
static uintptr data; |
| 113 |
> |
static uintptr proc; |
| 114 |
> |
static const uint32 size = 0x80000; // 512 KB |
| 115 |
|
public: |
| 116 |
|
static bool Init(void); |
| 117 |
|
static void Exit(void); |
| 118 |
|
static uint32 PageSize(); |
| 119 |
< |
static uintptr ZeroPage(); |
| 120 |
< |
static uintptr Reserve(uint32 size); |
| 119 |
> |
static uint32 ZeroPage(); |
| 120 |
> |
static uint32 Reserve(uint32 size); |
| 121 |
|
static void Release(uint32 size); |
| 122 |
+ |
static uint32 ReserveProc(uint32 size); |
| 123 |
|
friend class SheepVar; |
| 124 |
|
}; |
| 125 |
|
|
| 134 |
|
return page_size; |
| 135 |
|
} |
| 136 |
|
|
| 137 |
< |
inline uintptr SheepMem::ZeroPage() |
| 137 |
> |
inline uint32 SheepMem::ZeroPage() |
| 138 |
|
{ |
| 139 |
|
return zero_page; |
| 140 |
|
} |
| 141 |
|
|
| 142 |
< |
inline uintptr SheepMem::Reserve(uint32 size) |
| 142 |
> |
inline uint32 SheepMem::Reserve(uint32 size) |
| 143 |
|
{ |
| 144 |
< |
top -= align(size); |
| 145 |
< |
assert(top >= base); |
| 146 |
< |
return top; |
| 144 |
> |
data -= align(size); |
| 145 |
> |
assert(data >= proc); |
| 146 |
> |
return data; |
| 147 |
|
} |
| 148 |
|
|
| 149 |
|
inline void SheepMem::Release(uint32 size) |
| 150 |
|
{ |
| 151 |
< |
top += align(size); |
| 151 |
> |
data += align(size); |
| 152 |
> |
} |
| 153 |
> |
|
| 154 |
> |
inline uint32 SheepMem::ReserveProc(uint32 size) |
| 155 |
> |
{ |
| 156 |
> |
uint32 mproc = proc; |
| 157 |
> |
proc += align(size); |
| 158 |
> |
assert(proc < data); |
| 159 |
> |
return mproc; |
| 160 |
> |
} |
| 161 |
> |
|
| 162 |
> |
static inline uint32 SheepProc(const uint8 *proc, uint32 proc_size) |
| 163 |
> |
{ |
| 164 |
> |
uint32 mac_proc = SheepMem::ReserveProc(proc_size); |
| 165 |
> |
Host2Mac_memcpy(mac_proc, proc, proc_size); |
| 166 |
> |
return mac_proc; |
| 167 |
|
} |
| 168 |
|
|
| 169 |
|
class SheepVar |
| 170 |
|
{ |
| 171 |
< |
uintptr m_base; |
| 172 |
< |
uint32 m_size; |
| 171 |
> |
uint32 m_base; |
| 172 |
> |
uint32 m_size; |
| 173 |
|
public: |
| 174 |
|
SheepVar(uint32 requested_size); |
| 175 |
|
~SheepVar() { SheepMem::Release(m_size); } |
| 176 |
< |
uintptr addr() const { return m_base; } |
| 144 |
< |
void *ptr() const { return (void *)addr(); } |
| 176 |
> |
uint32 addr() const { return m_base; } |
| 177 |
|
}; |
| 178 |
|
|
| 179 |
|
inline SheepVar::SheepVar(uint32 requested_size) |
| 184 |
|
|
| 185 |
|
// TODO: optimize for 32-bit platforms |
| 186 |
|
|
| 187 |
< |
template< int size > |
| 187 |
> |
template< int requested_size > |
| 188 |
|
struct SheepArray : public SheepVar |
| 189 |
|
{ |
| 190 |
< |
SheepArray() : SheepVar(size) { } |
| 159 |
< |
uint8 *ptr() const { return (uint8 *)addr(); } |
| 190 |
> |
SheepArray() : SheepVar(requested_size) { } |
| 191 |
|
}; |
| 192 |
|
|
| 193 |
|
struct SheepVar32 : public SheepVar |
| 196 |
|
SheepVar32(uint32 value) : SheepVar(4) { set_value(value); } |
| 197 |
|
uint32 value() const { return ReadMacInt32(addr()); } |
| 198 |
|
void set_value(uint32 v) { WriteMacInt32(addr(), v); } |
| 168 |
– |
uint32 *ptr() const { return (uint32 *)addr(); } |
| 199 |
|
}; |
| 200 |
|
|
| 201 |
|
struct SheepString : public SheepVar |
| 202 |
|
{ |
| 203 |
|
SheepString(const char *str) : SheepVar(strlen(str) + 1) |
| 204 |
< |
{ if (str) strcpy((char *)addr(), str); else WriteMacInt8(addr(), 0); } |
| 204 |
> |
{ if (str) strcpy(value(), str); else WriteMacInt8(addr(), 0); } |
| 205 |
|
char *value() const |
| 206 |
< |
{ return (char *)addr(); } |
| 177 |
< |
char *ptr() const |
| 178 |
< |
{ return (char *)addr(); } |
| 206 |
> |
{ return (char *)Mac2HostAddr(addr()); } |
| 207 |
|
}; |
| 208 |
|
|
| 209 |
|
#endif |
